Hilgert, R. L., & Leonard, E. C. (2001). Supervision: Concepts and practice of management (8th ed.). South-Western College Publishing.
Lua i Stíl Chicago (17ú heag.)Hilgert, Raymond L., agus Edwin C. Leonard. Supervision: Concepts and Practice of Management. 8th ed. Cincinnati, Ohio: South-Western College Publishing, 2001.
Lua MLA (9ú heag.)Hilgert, Raymond L., agus Edwin C. Leonard. Supervision: Concepts and Practice of Management. 8th ed. South-Western College Publishing, 2001.
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