APA (7e ed.) Bronvermelding
Ruhe, R. V. (1969). Quaternary landscapes in Iowa ([1st ed.].). Iowa State University Press.
Chicago (17e ed.) Bronvermelding
Ruhe, Robert V. Quaternary Landscapes in Iowa. [1st ed.]. Ames: Iowa State University Press, 1969.
MLA (9e ed.) Bronvermelding
Ruhe, Robert V. Quaternary Landscapes in Iowa. [1st ed.]. Iowa State University Press, 1969.
Let op: Deze citaties zijn niet altijd 100% accuraat.