APA (7th ed.) Citation

Ballado, R. S., & Adalla, M. J. F. T. (2017). Problem solving. Great Books Trading.

Chicago Style (17th ed.) Citation

Ballado, Ronato S., and Mary June F. Tan Adalla. Problem Solving. Quezon City: Great Books Trading, 2017.

MLA (9th ed.) Citation

Ballado, Ronato S., and Mary June F. Tan Adalla. Problem Solving. Great Books Trading, 2017.