توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Trakulchang, S. (1977). Weight and backfat thickness adjustment factors in growing pigs [microform]. Photoduplication Service. University of the Philippines Library.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Trakulchang, Suraphol. Weight and Backfat Thickness Adjustment Factors in Growing Pigs [microform]. Quezon City: Photoduplication Service. University of the Philippines Library, 1977.

توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)

Trakulchang, Suraphol. Weight and Backfat Thickness Adjustment Factors in Growing Pigs [microform]. Photoduplication Service. University of the Philippines Library, 1977.