Cita APA (7a ed.)

Motz, L., & Duvven, A. (1967). Essentials of astronomy. Wadswerth Publ.

Cita Chicago Style (17a ed.)

Motz, Lloyd, y Anneta Duvven. Essentials of Astronomy. Belmont, CA: Wadswerth Publ, 1967.

Cita MLA (9a ed.)

Motz, Lloyd, y Anneta Duvven. Essentials of Astronomy. Wadswerth Publ, 1967.