APA (7th ed.) Citation

Ridpath Ian. (1999). Introdution to Astronomy. Todtri Book Publishers.

Chicago Style (17th ed.) Citation

Ridpath Ian. Introdution to Astronomy. New York: Todtri Book Publishers, 1999.

MLA (9th ed.) Citation

Ridpath Ian. Introdution to Astronomy. Todtri Book Publishers, 1999.

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