Gaya APA

Leonard, E, C., Hilgert, R, L. (2004). Supervision: concepts & practices of management 9E . New York: New York: Thomson, 2004.

Gaya MLA

Leonard, Edwin, C.., Hilgert, Rymond, L.. "Supervision: concepts & practices of management 9E". New York: New York: Thomson, 2004, 2004. Text.