Gaya APA
B, W., F. (1977).
Rural Water Supply And Sanitation third Ed. (Third Edition).
New York. USA:
Robert E Krieger Publ. Comp..
Gaya MLA
B, W., F..
Rural Water Supply And Sanitation third Ed..
Third Edition
New York. USA:
Robert E Krieger Publ. Comp.,
1977.
Text.