Raya, D. E. A. (2010). Strategic and operational issues in the Philippine palm oil industry. College of Business Administration, University of the Philippines.
Chicago-referens (17:e uppl.)Raya, Danilo Erwin A. Strategic and Operational Issues in the Philippine Palm Oil Industry. Quezon City: College of Business Administration, University of the Philippines, 2010.
MLA-referens (9:e uppl.)Raya, Danilo Erwin A. Strategic and Operational Issues in the Philippine Palm Oil Industry. College of Business Administration, University of the Philippines, 2010.
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