APA (7th ed.) Citation

Öpik, E. (1927). Measures of Double Stars: By E. Öpik. (K. Mattiesen).

Chicago Style (17th ed.) Citation

Öpik, E. Measures of Double Stars: By E. Öpik. Tartu: (K. Mattiesen), 1927.

MLA (9th ed.) Citation

Öpik, E. Measures of Double Stars: By E. Öpik. (K. Mattiesen), 1927.

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