Duffy, G. G., Roehler, L. R., & Sherman, G. B. (1977). How to teach reading systematically (2nd ed.). Happer & Row Pub..
Lua i Stíl Chicago (17ú heag.)Duffy, Gerald G., Laura R. Roehler, agus George B. Sherman. How to Teach Reading Systematically. 2nd ed. New York: Happer & Row Pub., 1977.
Lua MLA (9ú heag.)Duffy, Gerald G., et al. How to Teach Reading Systematically. 2nd ed. Happer & Row Pub., 1977.
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