Gaya APA

Hill, G, E., 1.J, . (1974). Management and Improvement of Guidance (ed. ke-2). New Jersey: Prentice- hall,Inc.

Gaya MLA

Hill, George, E., 1.J, . "Management and Improvement of Guidance". ed. ke-2 New Jersey: Prentice- hall,Inc, 1974. Text.