1. The Effect of Slow Sand Filter Maintenance on Water Quality
2. Pilot-Plant Studies of Slow-Rate Filtration
3. Huisman, L., 1977:Slow Sand Filtration.— Delft University of Technology, Delft, 122 pp.
4. Palmer, C. M., 1977:Algae and Water Pollution. — An Illustrated Manual on the Identification, Significance and Control of Algae in Water Supplies and in Polluted Water.— Cincinnati, Municipal Environmental Research Laboratory, 123 pp.