Science and Mathematics Education Manpower Development Project (SMEMDP) & Tan, M. C. (1998). Sourcebook on practical work for teacher trainers: High school earth/environmental science (Exp'l ed.). SMEMDP.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Science and Mathematics Education Manpower Development Project (SMEMDP) و Merle C. Tan. Sourcebook on Practical Work for Teacher Trainers: High School Earth/environmental Science. Exp'l ed. Diliman, Quezon City: SMEMDP, 1998.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Science and Mathematics Education Manpower Development Project (SMEMDP) و Merle C. Tan. Sourcebook on Practical Work for Teacher Trainers: High School Earth/environmental Science. Exp'l ed. SMEMDP, 1998.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.