Tangyong, A. F., & Matahelemual, Y. (1986). National training workshop for preparation of teaching/learning materials for primary level science topic related to real life situation: Follow-up APEID training workshop on primary science (Bangkok, August 1985 and Tokyo, November 1985. Jakarta: Office of Education and Culture Research and Development.

Tangyong, Agus F., and Yulaelawati Matahelemual. National Training Workshop for Preparation of Teaching/learning Materials for Primary Level Science Topic Related to Real Life Situation: Follow-up APEID Training Workshop On Primary Science (Bangkok, August 1985 and Tokyo, November 1985. Jakarta: Office of Education and Culture Research and Development, 1986.

Tangyong, Agus F., and Yulaelawati Matahelemual. National Training Workshop for Preparation of Teaching/learning Materials for Primary Level Science Topic Related to Real Life Situation: Follow-up APEID Training Workshop On Primary Science (Bangkok, August 1985 and Tokyo, November 1985. Jakarta: Office of Education and Culture Research and Development, 1986.