APA (7th ed.) Citation

Sharp, H. S. (1931). Landslide scar in the Centennial valley, Wyoming. American Journal of Science, 453.

Chicago Style (17th ed.) Citation

Sharp, H. S. "Landslide Scar in the Centennial Valley, Wyoming." American Journal of Science 1931: 453.

MLA (9th ed.) Citation

Sharp, H. S. "Landslide Scar in the Centennial Valley, Wyoming." American Journal of Science, 1931, p. 453.