APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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