APA (7th ed.) Citation

Kopal, Z. (1946). An introduction to the study of eclipsing variables. Harvard university press.

Chicago Style (17th ed.) Citation

Kopal, Zdeněk. An Introduction to the Study of Eclipsing Variables. Cambridge, Mass.: Harvard university press, 1946.

MLA (9th ed.) Citation

Kopal, Zdeněk. An Introduction to the Study of Eclipsing Variables. Harvard university press, 1946.