Duffy, G. G., Roehler, L. R., & Sherman, G. B. (1977). How to teach reading systematically (2nd ed.). Happer & Row Pub..

Duffy, Gerald G., Laura R. Roehler, and George B. Sherman. How to Teach Reading Systematically. 2nd ed. New York: Happer & Row Pub., 1977.

Duffy, Gerald G., et al. How to Teach Reading Systematically. 2nd ed. Happer & Row Pub., 1977.