1. Broertjes, C., 1968. Dose rate effects in Saintpaulia. Mutations in Plant Breeding II. IAEA, Vienna: 63–71.
2. Broertjes, C., 1969. Mutation breeding of Streptocarpus. Euphytica 18: 333–339.
3. Broertjes, C., 1972a. Mutation breeding of Achimenes. Euphytica 21: 48–63.
4. Broertjes, C. 1972b. Use in plant breeding of acute, chronic or fractionated doses of X-rays or fast neutrons as illustrated with leaves of Saintpaulia. Agric. Res. Rep. 776, 74 pp.
5. Broertjes, C., & H. Y. Alkema, 1970. Mutation breeding in flower bulbs. First Int. Symp. on Flowerbulbs 11: 407–412.