Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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