APA (7th ed.) Citation

Struve, O. v., & Zebergs, V. (1962). Astronomy of the 20th century (1. print.). Macmillan.

Chicago Style (17th ed.) Citation

Struve, Otto von, and Velta Zebergs. Astronomy of the 20th Century. 1. print. New York [u.a.]: Macmillan, 1962.

MLA (9th ed.) Citation

Struve, Otto von, and Velta Zebergs. Astronomy of the 20th Century. 1. print. Macmillan, 1962.