1. Ahmad Tarmizi Mohammed. (2009). Perusahaan Sawit di Malaysia- Satu Panduan. Bab 3: Pembajaan Sawit. 149-164.
2. Azman, A., J.L. D’silva, B.A. Samah, N. Man And H.A.M. Shaffril. (2013). The relationship between attitude, knowledge, and support towards the acceptance of sustainable agriculture among contract farmers in Malaysia. Asian Soc. Sci., 9: 99-105.
3. Bentley, J, And Andrews, K. (1996). Through the roadblocks: IPM and Central American smallholders. London: International Institute for Environment and Development. Gatekeeper Series No. 56. 1-19.
4. Brosius, P.J., G.W. Lovelace, And G.G. Marten. (1986). Ethnopedology: An approach to understanding traditional agricultural knowledge. In: Traditional Agriculture in Southeast Asia: A Human Ecology Perspective, Marten, G.G. (Ed.) Westview Press Boulder, CO, USA, pp: 187-198.
5. Chew, P S; Kee, K K; Goh, K J; Quah, Y T, and Tey, Sh. (1992). Fertilizer Management in oil palm. Proc. of the International Conference on fertilizer usage in the tropic Aziz, B Ed.). Malaysia Society of Soil Science, Kuala Lumpur. 43-67.
6. Goh, K J; Chew. P S And Teo, C B. (1994). Maximising and maintaining oil palm yields on a commercial scale in Malaysia. In: Chee K.H. (ed. Proc. 1994 Int. Planters Conf. On Management for Enhanced Profitability in Plantations. ISP, Kuala Lumpur. 121-142.
7. Goh, K J, and Hardter, R. (2003). General Oil Palm Nutrition. In: Fairhurst, T.H., And Hardter, R. (Eds.) Oil Palm: Management for Large and sustainable Yields. PPI, Switzerland, 191-230.
8. Goh, K J; Ng, P H C, And Lee, C T. (2009). Fertilizer management and productivity of oil palm in Malaysia. Advanced Agroecological Research (AAR) Newsletter (October, 2009); 1-24.
9. Grossman, J.M. (2003). Exploring farmer perception of soil process in organic coffee systems of Chiapas, Mexico. Geoderma, 111:267-287.
10. Hasnida, A W; Shahrina M N; Lai, F W; Hasrina M; Ammar, A R R. (2014). Impact of marketing communication strategies on consumers’ acceptance and brand equity in Malaysian fertilizer industry. Australian Journal of Basic and Applied Sciences, 8(5) Special 2014. 157-162.
11. Idris, O and Nursuhana, D. (2009). Enhancing oil palm productivity through participative technology transfer: the Malaysian experience.
12. Kee, K K; Goh K J; Chew, P S, And Tey, S H. (1994). An integrated site-specific recommendation system (INFERS) for high productivity in mature oil palm. International Planters Conference on management for Enhanced Profitability in the plantation (Chee, KH Ed.). Incorporated Society of Planters, Kuala Lumpur. 38-100.
13. Krejcie R.V and Morgan D.W. (1970). Determining sample size for research activities. Educational and Psychological Measurement, 30, 607-610.
14. MPOB. (2015). Fact Sheet Pekebun Kecil Disember 2014, Unpublished, MPOB, Bangi.
15. NKEA. (2011). Report on National Key Economic Area (NKEA), PEMANDU, Putrajaya.
16. Parveez, G.K.A.; Elina Hishamuddin; Soh Kheng Loh; Meilina Ong Abdullah; kamalrudin Mohamed Salled; Mohd Noor Izuddin Zanal Bidin; Shamala Sundram; Zafarizal aldrin Azizul Hasan and Zainab Idris. (2020). Oil Palm Economic Performance in Malaysia And R & D; Progress In 2019. Journal of Oil Palm Research. Vol 32 (2) June 2020 p. 159-190.
17. Pillegowda, S M; Laskhminayana, M T, and Bhaskar, V. (2010). Knowledge assessment of sugarcane growers regarding recommended cultivated practices. Karnataka J. Agric. Sci, Vol.23 (3): 434-436.
18. Roberts T I. (2007). Right product, right rate, right time and right place the foundation of best management practices for fertilizer. In ‘Fertilizer best management practices: General principles, strategy for their adoption, and voluntary initiatives versus regulations’. IFA International workshop on fertilizer best management practices. (Brussels, Belgium). 29-32.
19. Ramesh, V. (2013). Managing oil palm plantation amidst low CPO prices and rising cost of production. Paper presented at the PIPOC 2013 International Palm Oil Congress, Kuala Lumpur Convention Centre.
20. Serah W K; Jayne N M; Monicah M; Franklin S M and Danial N M. (2012). Influence of education levels on the dissemination of soil fertility management information in the central highlands of Kenya. Journal of Agriculture and Rural Development in the tropics and subtropics.Vol. 113 No.2: 89-99.
21. Tarmizi, A M; Tayeb, M D, and Zin, Z Z. (1992). Maximum yield of oil palm in Peninsular Malaysia: Yield response and efficiency of nutrient recovery. In proceedings 1990 ISOPB Workshop on Yield Potential in the Oil Palm, Phuket, Thailand: International Society for Oil Palm Breeders and PORIM, Kuala Lumpur. 145-153.
22. Tan, B.T. (1988). Cost of Palm Oil Production in major producing countries. In Proc. In 1987 International Oil Palm Conference – Agriculture, PORIM, Kuala Lumpur. 339-354.