Cita APA (7th ed.)

Alfiler, M. C. P. (2001). Philippine administrative system. UP Open University.

Cita Chicago (17th ed.)

Alfiler, Ma. Concepcion P. Philippine Administrative System. Diliman, Quezon City: UP Open University, 2001.

Cita MLA (9th ed.)

Alfiler, Ma. Concepcion P. Philippine Administrative System. UP Open University, 2001.