APA (7e ed.) Bronvermelding

De Leon, H. S. (1994). The National internal revenue code annotated: (P.D. No. 1158, as amended) (5th ed.). Rex Book Store.

Chicago (17e ed.) Bronvermelding

De Leon, Hector S. The National Internal Revenue Code Annotated: (P.D. No. 1158, as Amended). 5th ed. Manila: Rex Book Store, 1994.

MLA (8e ed.) Bronvermelding

De Leon, Hector S. The National Internal Revenue Code Annotated: (P.D. No. 1158, as Amended). 5th ed. Rex Book Store, 1994.