APA
Gerrard J., . (1992). Soil geomorphology. London: Chapman & Hall.
Chicago
Gerrard John, . 1992. Soil geomorphology. London: Chapman & Hall.
Harvard
Gerrard J., . (1992). Soil geomorphology. London: Chapman & Hall.
MLA
Gerrard John, . Soil geomorphology. London: Chapman & Hall. 1992.