Gartrell, D., & Gartrell, D. ß. G. a. t. d. (1997). A guidance approach for the encouraging classroom (2nd ed.). Delmar Publishers.
Lua i Stíl Chicago (17ú heag.)Gartrell, Daniel, agus Daniel. ßt Guidance approach to discipline Gartrell. A Guidance Approach for the Encouraging Classroom. 2nd ed. Albany, N.Y: Delmar Publishers, 1997.
Lua MLA (9ú heag.)Gartrell, Daniel, agus Daniel. ßt Guidance approach to discipline Gartrell. A Guidance Approach for the Encouraging Classroom. 2nd ed. Delmar Publishers, 1997.
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