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