Wright, F. B. (1956). Rural water supply and sanitation (2d ed.). Wiley.
Dyfyniad Arddull ChicagoWright, Forrest Blythe. Rural Water Supply and Sanitation. 2d ed. New York: Wiley, 1956.
Dyfyniad MLAWright, Forrest Blythe. Rural Water Supply and Sanitation. 2d ed. Wiley, 1956.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.