APA (7th ed.) Citation

(1989). Encyclopedia of astronomy and astrophysics (1.print.). Acad. Pr.

Chicago Style (17th ed.) Citation

Encyclopedia of Astronomy and Astrophysics. 1.print. San Diego, Calif. [u.a.]: Acad. Pr, 1989.

MLA (9th ed.) Citation

Encyclopedia of Astronomy and Astrophysics. 1.print. Acad. Pr, 1989.