Cita APA (7th ed.)

University of the Philippines, Learning Resource Center, Elec, B. M., Lerios, M. C., Belarmino, M. C., Velasquez, G. A., & Panopio, R. G. (1999). Personalized System of Instruction (PSI) for college algebra. University of the Philippines, Learning Resource Center.

Cita Chicago (17th ed.)

University of the Philippines, Learning Resource Center, Bernarda M. Elec, Marcelina C. Lerios, Myrna C. Belarmino, Gemma A. Velasquez, i Rolando G. Panopio. Personalized System of Instruction (PSI) for College Algebra. Quezon City: University of the Philippines, Learning Resource Center, 1999.

Cita MLA (9th ed.)

University of the Philippines, Learning Resource Center, et al. Personalized System of Instruction (PSI) for College Algebra. University of the Philippines, Learning Resource Center, 1999.