APA (7th ed.) Citation

Philippines & Rex Editorial Staff. (1981). National internal revenue code .. (7th rev. and enl.). Rex Book Store.

Chicago Style (17th ed.) Citation

Philippines and Rex Editorial Staff. National Internal Revenue Code .. 7th rev. and enl. Manila: Rex Book Store, 1981.

MLA (9th ed.) Citation

Philippines and Rex Editorial Staff. National Internal Revenue Code .. 7th rev. and enl. Rex Book Store, 1981.