APA

Motz L., Duveen A., . (1977). Essentials of astronomy. New York: Columbia University Press.

Chicago

Motz Lloyd, Duveen Anneta, . 1977. Essentials of astronomy. New York: Columbia University Press.

Harvard

Motz L., Duveen A., . (1977). Essentials of astronomy. New York: Columbia University Press.

MLA

Motz Lloyd, Duveen Anneta, . Essentials of astronomy. New York: Columbia University Press. 1977.