APA (7th ed.) Citation

Popham, E. L., Schrag, A. F., & Blockhus, W. (1975). A teaching-learning system for business education. National Book Store.

Chicago Style (17th ed.) Citation

Popham, Estelle L., Adele Frisbie Schrag, and Wanda Blockhus. A Teaching-learning System for Business Education. Manila: National Book Store, 1975.

MLA (9th ed.) Citation

Popham, Estelle L., et al. A Teaching-learning System for Business Education. National Book Store, 1975.