Callahan, J. F., Clark, L. H., & Kellough, R. D. (2002). Teaching in the middle and secondary schools (7th ed.). Merrill.
Lua i Stíl Chicago (17ú heag.)Callahan, Joseph F., Leonard H. Clark, agus Richard D. Kellough. Teaching in the Middle and Secondary Schools. 7th ed. Upper Saddle River, N.J.: Merrill, 2002.
Lua MLA (9ú heag.)Callahan, Joseph F., et al. Teaching in the Middle and Secondary Schools. 7th ed. Merrill, 2002.
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