APA استشهاد

Ward, R. C. (1967). Principles of hydrology. McGraw-Hill.

استشهاد بنمط شيكاغو

Ward, R C. Principles of Hydrology. Newyork: McGraw-Hill, 1967.

MLA استشهاد

Ward, R C. Principles of Hydrology. McGraw-Hill, 1967.