Cita APA (7th ed.)

De Villa, J. G., & De Villa, R. G. (1997). Philippine vacations and explorations (2nd ed.). Brier Projects.

Cita Chicago (17th ed.)

De Villa, Jill Gale, i Rebecca Gale De Villa. Philippine Vacations and Explorations. 2nd ed. Makati City: Brier Projects, 1997.

Cita MLA (9th ed.)

De Villa, Jill Gale, i Rebecca Gale De Villa. Philippine Vacations and Explorations. 2nd ed. Brier Projects, 1997.