Philippine Printing Technical Foundation. (1990). Graphic arts directory. Published by the Philippine Printing Technical Foundation.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Philippine Printing Technical Foundation. Graphic Arts Directory. Manila: Published by the Philippine Printing Technical Foundation, 1990.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Philippine Printing Technical Foundation. Graphic Arts Directory. Published by the Philippine Printing Technical Foundation, 1990.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.