Gaya APA
Knapp, B.
(1979, 1989).
Elements of Geographical Hydrology (E-Book)
.
United Kingdom:
UNWIN HYMAN.
Gaya MLA
Knapp, Brian.
"Elements of Geographical Hydrology (E-Book)".
United Kingdom:
UNWIN HYMAN,
1979, 1989.
E-book.