APA (7th ed.) Citation

Craig, G. S., & Baldwin, S. E. (1940). Our earth and sky. Ginn.

Chicago Style (17th ed.) Citation

Craig, Gerald S., and Sara E. Baldwin. Our Earth and Sky. Boston, New York, Chicago u.a: Ginn, 1940.

MLA (9th ed.) Citation

Craig, Gerald S., and Sara E. Baldwin. Our Earth and Sky. Ginn, 1940.