Borromeo, M. E., Manzanilla, M. R. V., & Paras, E. P. A. (1987). Polyurethane and lumbang oil production. College of Engineering.
Cita Chicago (17th ed.)Borromeo, Melissa-Sieglinde E., Ma. Ranila V. Manzanilla, i Eleanor Patricia A. Paras. Polyurethane and Lumbang Oil Production. Diliman, Quezon City: College of Engineering, 1987.
Cita MLA (9th ed.)Borromeo, Melissa-Sieglinde E., et al. Polyurethane and Lumbang Oil Production. College of Engineering, 1987.
Atenció: Aquestes cites poden no estar 100% correctes.