APA

Freeman M. B., Freeman I. M., . (1953). Fun with astronomy. New York: Random House.

Chicago

Freeman Mae Blacker, Freeman Ira Maximilian, . 1953. Fun with astronomy. New York: Random House.

Harvard

Freeman M. B., Freeman I. M., . (1953). Fun with astronomy. New York: Random House.

MLA

Freeman Mae Blacker, Freeman Ira Maximilian, . Fun with astronomy. New York: Random House. 1953.