APA (7th ed.) Citation

Geological Survey, Henderson, J. R., & Vargo, J. L. (1965). Aeromagnetic map of Central Iowa. The Survey.

Chicago Style (17th ed.) Citation

Geological Survey, John R. Henderson, and Joseph L. Vargo. Aeromagnetic Map of Central Iowa. Washington, D.C.: The Survey, 1965.

MLA (8th ed.) Citation

Geological Survey, et al. Aeromagnetic Map of Central Iowa. The Survey, 1965.