APA (7th ed.) Citation

Salisbury, N. E., Knox, J. C., & Stephenson, R. A. (1968). The valleys of Iowa. Univ. of Iowa, Dept. of Geography.

Chicago Style (17th ed.) Citation

Salisbury, Neil E., James C. Knox, and Richard A. Stephenson. The Valleys of Iowa. Iowa City: Univ. of Iowa, Dept. of Geography, 1968.

MLA (9th ed.) Citation

Salisbury, Neil E., et al. The Valleys of Iowa. Univ. of Iowa, Dept. of Geography, 1968.