APA (7th ed.) Citation

Öpik, E. J. (1960). The oscillating universe. New American Library.

Chicago Style (17th ed.) Citation

Öpik, Ernst Julius. The Oscillating Universe. [New York]: New American Library, 1960.

MLA (9th ed.) Citation

Öpik, Ernst Julius. The Oscillating Universe. New American Library, 1960.

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