Mc Whirter, J. R. (1978). The Use of High-Purity Oxygen in the Activated Sludge Process. CRC Press.
Dyfyniad Arddull ChicagoMc Whirter, John. R. The Use of High-Purity Oxygen in the Activated Sludge Process. Florida: CRC Press, 1978.
Dyfyniad MLAMc Whirter, John. R. The Use of High-Purity Oxygen in the Activated Sludge Process. CRC Press, 1978.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.