APA

Orr C., . (1959). Between earth and space. New York: Macmillan.

Chicago

Orr Clyde, . 1959. Between earth and space. New York: Macmillan.

Harvard

Orr C., . (1959). Between earth and space. New York: Macmillan.

MLA

Orr Clyde, . Between earth and space. New York: Macmillan. 1959.