Dela Vega, G., Galarosa, I. A., Mayoralgo, A. B., Pira, M. C., & Senar, R. (1991). A Systems study and procedures study on the Philippine Petroleum Corporation. College of Engineering.
Citação do estilo Chicago (17ª ed.)Dela Vega, Geraldine, Iris Ann Galarosa, Anna Belen Mayoralgo, Ma. Cristina Pira, e Racquel Senar. A Systems Study and Procedures Study on the Philippine Petroleum Corporation. Diliman, Quezon City: College of Engineering, 1991.
Citação MLA (9ª ed.)Dela Vega, Geraldine, et al. A Systems Study and Procedures Study on the Philippine Petroleum Corporation. College of Engineering, 1991.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.