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-viite (17. p.)Philippines. Laws, statutes, etc, ja Hector S. De Leon. The National Internal Revenue Code Annotated: As Amended Up to Pres. Decree No. 820. Manila: National Book Store, 1975.
MLA-viite (9. p.)Philippines. Laws, statutes, etc, ja Hector S. De Leon. The National Internal Revenue Code Annotated: As Amended Up to Pres. Decree No. 820. National Book Store, 1975.
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