Tax Service of the Philippines, Inc. (1970). The Omnibus revenue law: Republic Act No. 6110 as supplement No. 27 to the historically developed Philippine National Internal Revenue Code updated to and published April 1970 with supplements Nos. 28, 29 and 30. s.n.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Tax Service of the Philippines, Inc. The Omnibus Revenue Law: Republic Act No. 6110 as Supplement No. 27 to the Historically Developed Philippine National Internal Revenue Code Updated to and Published April 1970 with Supplements Nos. 28, 29 and 30. [Metro Manila]: s.n, 1970.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Tax Service of the Philippines, Inc. The Omnibus Revenue Law: Republic Act No. 6110 as Supplement No. 27 to the Historically Developed Philippine National Internal Revenue Code Updated to and Published April 1970 with Supplements Nos. 28, 29 and 30. s.n, 1970.