Cita APA (7th ed.)

Estolas, J. V., Salvador, S. M., & Villalva, Z. S. (1989). Marketing research for Filipinos. National Book Store.

Cita Chicago (17th ed.)

Estolas, Josefina Villanueva, Samuel M. Salvador, i Zenaida S. Villalva. Marketing Research for Filipinos. Metro Manila: National Book Store, 1989.

Cita MLA (9th ed.)

Estolas, Josefina Villanueva, et al. Marketing Research for Filipinos. National Book Store, 1989.