APA (7th ed.) Citation

Tysdal, R. G., Thorman, C. H., & Liberian Geological Survey. (1983). Geologic map of Liberia. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Tysdal, Russell G., Charles H. Thorman, and Liberian Geological Survey. Geologic Map of Liberia. Reston, Va.: U.S. Geological Survey, 1983.

MLA (8th ed.) Citation

Tysdal, Russell G., et al. Geologic Map of Liberia. U.S. Geological Survey, 1983.