APA (7e ed.) Bronvermelding

Letran, C. C. (1976). An analysis of the use of the process approach for teaching grades I and II elementary science in the public schools in the Division of Isabela during the school year 1969-1970. Photoduplication Service. University of the Philippines Library.

Chicago (17e ed.) Bronvermelding

Letran, Carmen Collado. An Analysis of the Use of the Process Approach for Teaching Grades I and II Elementary Science in the Public Schools in the Division of Isabela During the School Year 1969-1970. Quezon City: Photoduplication Service. University of the Philippines Library, 1976.

MLA (9e ed.) Bronvermelding

Letran, Carmen Collado. An Analysis of the Use of the Process Approach for Teaching Grades I and II Elementary Science in the Public Schools in the Division of Isabela During the School Year 1969-1970. Photoduplication Service. University of the Philippines Library, 1976.