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Azhar Ahmad, Ahmad Raflis Che Omar, Lokhman Hakim Osman, Norazlan Alias, Mara Ridhuan Abdul Rahman, Suraiya Ishak, Mohd Abdullah Jusoh, Md Shafiin Shukor.  (2017).  Influencing factors in doing business: The case of oil palm smallholders.  - International Journal of Advanced and Applied Sciences.  108-113. 

Halima Begum, Er Ah Choy, Chamhuri Siwar, A. S. A. Ferdous Alam, Suraya ishak.  (2015).  Smallholder`s practices towards environment sustainability.  - Advanced Science Letters.  1742-1745(4).