APA (7th ed.) Citation

Heinlein, R. A. (1959). Double star. Science Fiction Book Club.

Chicago Style (17th ed.) Citation

Heinlein, Robert A. Double Star. London: Science Fiction Book Club, 1959.

MLA (9th ed.) Citation

Heinlein, Robert A. Double Star. Science Fiction Book Club, 1959.

Warning: These citations may not always be 100% accurate.