APA (7th ed.) Citation

Greenstone, S., & Smith, M. (1981). Intermediate Astronomy.

Chicago Style (17th ed.) Citation

Greenstone, Sid, and Murray Smith. Intermediate Astronomy. 1981.

MLA (9th ed.) Citation

Greenstone, Sid, and Murray Smith. Intermediate Astronomy. 1981.

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