Institute of Vocational Training and Development. Information and Documentation Services. Catalogue of training materials. Part 1-Print. National Manpower and Youth Council.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Institute of Vocational Training and Development. Information and Documentation Services. Catalogue of Training Materials. Part 1-Print. Taguig: National Manpower and Youth Council.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Institute of Vocational Training and Development. Information and Documentation Services. Catalogue of Training Materials. Part 1-Print. National Manpower and Youth Council.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.