APA (7th ed.) Citation

Helgren, D. M., Sager, R. J., & Israel, S. (1985). World Geography Today. Holt, Rinehart and Winston.

Chicago Style (17th ed.) Citation

Helgren, David M., Robert J. Sager, and Saul Israel. World Geography Today. New York: Holt, Rinehart and Winston, 1985.

MLA (9th ed.) Citation

Helgren, David M., et al. World Geography Today. Holt, Rinehart and Winston, 1985.