APA (7th ed.) Citation

Asin, R. C. (1985). Simplified solutions to problems in trigonometry. National Book Store.

Chicago Style (17th ed.) Citation

Asin, Ricardo C. Simplified Solutions to Problems in Trigonometry. Manila: National Book Store, 1985.

MLA (9th ed.) Citation

Asin, Ricardo C. Simplified Solutions to Problems in Trigonometry. National Book Store, 1985.