Certo, S. C. (2000). Supervision: Concepts and skill building (3rd ed.). Irwin.
Lua i Stíl Chicago (17ú heag.)Certo, Samuel C. Supervision: Concepts and Skill Building. 3rd ed. Illinois: Irwin, 2000.
Lua MLA (9ú heag.)Certo, Samuel C. Supervision: Concepts and Skill Building. 3rd ed. Irwin, 2000.
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