J. D. Johnson,
Disinfection water and wastewater. Ann Arbor, MI, USA: Ann Arbor Science, 1975, p. vi, 425 p. : fig., tab.
EAWAG -Duebendorf, CH, Swiss Federal Institute for Environmental Science and Technology and University of Oklahoma -Norman, OK, US,
“A study on historical methods of water and sewage treatment”. Swiss Federal Institute for Environmental Science and Technology (EAWAG), Duebendorf, Switzerland, p. 15, ix, 23 p. : fig., photogr., 1975.
G. W. Reid,
“Water test kit I : user's manual”. University of Oklahoma. Bureau of Water and Environmental Resources Research, Norman, OK, USA, p. i, 30 p.: fig., tab., 1975.