APA (7th ed.) Citation

Santos, N. A., Santos, D. A., & Del Rosario, E. F. (1988). Up the mountain. Little Big Books.

Chicago Style (17th ed.) Citation

Santos, Natividad A., Dinna A. Santos, and E. F. Del Rosario. Up the Mountain. [Metro Manila]: Little Big Books, 1988.

MLA (9th ed.) Citation

Santos, Natividad A., et al. Up the Mountain. Little Big Books, 1988.