Blough, G. O., & Schwartz, J. (1990). Elementary school science and how to teach it (8th ed.). Fort Worth: Holt.
Trích dẫn kiểu ChicagoBlough, Glenn Orlando., và Julius Schwartz. Elementary School Science and How to Teach It. 8th ed. Fort Worth: Holt, 1990.
MLA CitationBlough, Glenn Orlando., và Julius Schwartz. Elementary School Science and How to Teach It. 8th ed. Fort Worth: Holt, 1990.
Advarsel: Disse citationer er muligvist ikke 100% nøjagtige.