APA (7th ed.) Citation

Heavens, O. S. (1964). Optical masers / by O.S. Heavens. Methuen.

Chicago Style (17th ed.) Citation

Heavens, O. S. Optical Masers / by O.S. Heavens. London: Methuen, 1964.

MLA (9th ed.) Citation

Heavens, O. S. Optical Masers / by O.S. Heavens. Methuen, 1964.

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