Παραπομπή APA

Walton,William C. (1970). Groundwater resource evaluation. McGraw hill.

Παραπομπή Chicago Style

Walton,William C. Groundwater Resource Evaluation. London: McGraw hill, 1970.

Παραπομπή MLA

Walton,William C. Groundwater Resource Evaluation. McGraw hill, 1970.