Philippines. Laws, statutes, etc, & De Leon, H. S. (1975). The national internal revenue code annotated: As amended up to Pres. Decree No. 820. National Book Store.
Chicago-referens (17:e uppl.)Philippines. Laws, statutes, etc, och Hector S. De Leon. The National Internal Revenue Code Annotated: As Amended Up to Pres. Decree No. 820. Manila: National Book Store, 1975.
MLA-referens (9:e uppl.)Philippines. Laws, statutes, etc, och Hector S. De Leon. The National Internal Revenue Code Annotated: As Amended Up to Pres. Decree No. 820. National Book Store, 1975.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.