Gaya APA

Lansdown, B. et al (1971). Teaching Elementary Science : Throught Investigation And Colloquium . New York: Harcourt Brace Jovanovich.

Gaya MLA

Lansdown, Brenda. et al. "Teaching Elementary Science : Throught Investigation And Colloquium". New York: Harcourt Brace Jovanovich, 1971. Text.