Nussel, E. J., Inglis, J. D., & Wiersma, W. (1976). The teacher and individually guided education. Addison-Wesley Pub. Co..

Nussel, Edward J., Joan D. Inglis, and William Wiersma. The Teacher and Individually Guided Education. Reading, Mass.: Addison-Wesley Pub. Co., 1976.

Nussel, Edward J., et al. The Teacher and Individually Guided Education. Addison-Wesley Pub. Co., 1976.