1. Wettlauf mit der Resistenz. Hauptproblem der Schädlingsbekämpfung. Chem. Industrie 15, 13 (1963).
2. The Pesticide Situation for 1962–63 (Sept. 63) und The Pesticide Situation for 1964–65. U.S. Dep. of Agriculture, Sept. 1965.
3. Upward trend continues. Herbicides lead Increase in Pesticide Sales. Agric. Chemicals 20 (10), 46 (1965).
4. Shepard, H. H., and N. Mahan: Use of Agricultural Chemicals Continues to Rise. Chem. Engng. News 44 (36), 82 (1966).
5. Here's what they're saying about the 1966 Pesticide Season. Farm Chemicals 129 (10), 28 (1966).