Παραπομπή APA

Ward, R. C., & Robinson, M. (2000). Principles of hydrology (Ed.4.). McGraw-Hill.

Παραπομπή Chicago Style

Ward, R C., και M. Robinson. Principles of Hydrology. Ed.4. London: McGraw-Hill, 2000.

Παραπομπή MLA

Ward, R C., και M. Robinson. Principles of Hydrology. Ed.4. McGraw-Hill, 2000.