एपीए उद्धरण

Blough, G. O., & Schwartz, J. (1990). Elementary school science and how to teach it (8th ed.). Fort Worth: Holt.

शिकागो स्टाइल उद्धरण

Blough, Glenn Orlando., और Julius Schwartz. Elementary School Science and How to Teach It. 8th ed. Fort Worth: Holt, 1990.

एमएलए उद्धरण

Blough, Glenn Orlando., और Julius Schwartz. Elementary School Science and How to Teach It. 8th ed. Fort Worth: Holt, 1990.