APA (7th ed.) Citation

England, W. B., & Leenders, M. R. (1975). Purchasing and materials management (6th ed.). National Book Store.

Chicago Style (17th ed.) Citation

England, Wilbur B., and Michiel R. Leenders. Purchasing and Materials Management. 6th ed. Manila: National Book Store, 1975.

MLA (9th ed.) Citation

England, Wilbur B., and Michiel R. Leenders. Purchasing and Materials Management. 6th ed. National Book Store, 1975.