Librero, A. R., Valmayor, R. V., & Perez, M. L. (1987). Research evaluation systems in agriculture and natural resources in the Philippines. International Development Research Centre.
Chicago Style (17. basım) AtıfLibrero, Aida Recto, Ramon V. Valmayor, ve Maripaz L. Perez. Research Evaluation Systems in Agriculture and Natural Resources in the Philippines. Los Banos, Laguna: International Development Research Centre, 1987.
MLA (9th ed.) AtıfLibrero, Aida Recto, et al. Research Evaluation Systems in Agriculture and Natural Resources in the Philippines. International Development Research Centre, 1987.
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