Gaya APA
Cairncross, S, &, R, F. (1978).
Small water supplies. .
London dsl:
The Roos institute of Tropical Hygiene.
Gaya MLA
Cairncross, Sandy, &, Richard, Feachem.
"Small water supplies. ".
London dsl:
The Roos institute of Tropical Hygiene,
1978.
Buku.