Gaya APA
Ward, R., Robinson, M.
(1989).
Principles of Hydrology Third edition
.
LONDON:
MCGRAW-HILL BOOK COMPANY.
Gaya MLA
Ward, R.C., Robinson, M..
"Principles of Hydrology Third edition".
LONDON:
MCGRAW-HILL BOOK COMPANY,
1989.
Text.