APA (7th ed.) Citation

Zietz, I., Gilbert, F. P., & Kirby, J. R., Jr. (1976). Aeromagnetic map of Iowa: Color coded intensities. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Zietz, Isidore, Francis P. Gilbert, and John R. Kirby, Jr. Aeromagnetic Map of Iowa: Color Coded Intensities. Reston, Va.: U.S. Geological Survey, 1976.

MLA (8th ed.) Citation

Zietz, Isidore, et al. Aeromagnetic Map of Iowa: Color Coded Intensities. U.S. Geological Survey, 1976.