APA aipamena

Philippines (Republic) Bureau of Internal Revenue, Gapultos, S. M., & Mamangun, M. C. (1968). Digest of numbered B.I.R. rulings; series of 1968, plus various numbered revenue memorandum circulars and revenue regulations. DM Press.

Chicago Style aipamena

Philippines (Republic) Bureau of Internal Revenue, Santiago M. Gapultos, and Marina C. Mamangun. Digest of Numbered B.I.R. Rulings; Series of 1968, Plus Various Numbered Revenue Memorandum Circulars and Revenue Regulations. Quezon City: DM Press, 1968.

MLA aipamena

Philippines (Republic) Bureau of Internal Revenue, et al. Digest of Numbered B.I.R. Rulings; Series of 1968, Plus Various Numbered Revenue Memorandum Circulars and Revenue Regulations. DM Press, 1968.