APA (7th ed.) Citation

De Leon, H. S., & De Leon Jr. , H. M. (2011). The National Internal Revenue Code annotated: (P.D. No. 1158, as amended up to R.A. No. 10021) (2011 9th ed.). Rex Book Store.

Chicago Style (17th ed.) Citation

De Leon, Hector S., and Hector M. De Leon Jr. The National Internal Revenue Code Annotated: (P.D. No. 1158, as Amended Up to R.A. No. 10021). 2011 9th ed. Manila: Rex Book Store, 2011.

MLA (9th ed.) Citation

De Leon, Hector S., and Hector M. De Leon Jr. The National Internal Revenue Code Annotated: (P.D. No. 1158, as Amended Up to R.A. No. 10021). 2011 9th ed. Rex Book Store, 2011.