Παραπομπή APA

Peter W Birkeland. (1999). Soil and geomorphology (3rd.). Oxford University Press.

Παραπομπή Chicago Style

Peter W Birkeland. Soil and Geomorphology. 3rd. New York: Oxford University Press, 1999.

Παραπομπή MLA

Peter W Birkeland. Soil and Geomorphology. 3rd. Oxford University Press, 1999.