Charles, C., & Barr, K. B. (1992). Building classroom discipline (4th.ed.). Longman.
Lua i Stíl Chicago (17ú heag.)Charles, C.M, agus Karen Blaine Barr. Building Classroom Discipline. 4th.ed. New York: Longman, 1992.
Lua MLA (9ú heag.)Charles, C.M, agus Karen Blaine Barr. Building Classroom Discipline. 4th.ed. Longman, 1992.
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