Sauer, C. O. (1927). Geography of Pennyroyal: A study of the influence of geology and physiography upon the industry, commerce and life of the people (1. ed.). Kentucky Geological Survey.
Chicago-Zitierstil (17. Ausg.)Sauer, Carl Ortwin. Geography of Pennyroyal: A Study of the Influence of Geology and Physiography upon the Industry, Commerce and Life of the People. 1. ed. Frankfort, Ky: Kentucky Geological Survey, 1927.
MLA-Zitierstil (9. Ausg.)Sauer, Carl Ortwin. Geography of Pennyroyal: A Study of the Influence of Geology and Physiography upon the Industry, Commerce and Life of the People. 1. ed. Kentucky Geological Survey, 1927.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.