APA (7th ed.) Citation

De Leon, H. S., & De Leon, H. M. (2001). Comments and cases on sales (4th ed.). Published & distributed by Rex Book Store.

Chicago Style (17th ed.) Citation

De Leon, Hector S., and Hector M. De Leon. Comments and Cases on Sales. 4th ed. Manila, Philippines: Published & distributed by Rex Book Store, 2001.

MLA (9th ed.) Citation

De Leon, Hector S., and Hector M. De Leon. Comments and Cases on Sales. 4th ed. Published & distributed by Rex Book Store, 2001.