Trowbridge, A. C., Shaw, E. W., & Schockel, B. H. (1916). Geology and geography of the Galena and Elizabeth quadrangles. Illinois state geological survey, University of Illinois.
Chicago Style (17th ed.) CitationTrowbridge, Arthur C., E. W. Shaw, and Bernard Henry Schockel. Geology and Geography of the Galena and Elizabeth Quadrangles. Urbana: Illinois state geological survey, University of Illinois, 1916.
MLA (9th ed.) CitationTrowbridge, Arthur C., et al. Geology and Geography of the Galena and Elizabeth Quadrangles. Illinois state geological survey, University of Illinois, 1916.
Warning: These citations may not always be 100% accurate.