APA aipamena

GIBSON, J. (1990). SUPERVISORY CHALLENGES. MERRILL PUB. CO.

Chicago Style aipamena

GIBSON, J.W. SUPERVISORY CHALLENGES. COLUMBUS: MERRILL PUB. CO, 1990.

MLA aipamena

GIBSON, J.W. SUPERVISORY CHALLENGES. MERRILL PUB. CO, 1990.