Great Courses (Firm),$4dst, & Kanopy (Firm),$4dst. (2013). The World's Greatest Geological Wonders: 36 Spectacular Sites Collection. The Great Courses.
Chicago Style (17th ed.) CitationGreat Courses (Firm),$4dst, and Kanopy (Firm),$4dst. The World's Greatest Geological Wonders: 36 Spectacular Sites Collection. [San Francisco, California, USA]: The Great Courses, 2013.
MLA (9th ed.) CitationGreat Courses (Firm),$4dst, and Kanopy (Firm),$4dst. The World's Greatest Geological Wonders: 36 Spectacular Sites Collection. The Great Courses, 2013.
Warning: These citations may not always be 100% accurate.