Raya, D. E. A. (2010). Strategic and operational issues in the Philippine palm oil industry. College of Business Administration, University of the Philippines.
Lua i Stíl Chicago (17ú heag.)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.
Lua MLA (9ú heag.)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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