APA (7th ed.) Citation

Heil, D., & Allen, M. C. (1994). Discover the wonder: Module D : the earth and sky.

Chicago Style (17th ed.) Citation

Heil, David, and Maureen Cooney Allen. Discover the Wonder: Module D : The Earth and Sky. Illinois, 1994.

MLA (9th ed.) Citation

Heil, David, and Maureen Cooney Allen. Discover the Wonder: Module D : The Earth and Sky. 1994.