APA

Hill N. C., . (1981). Counseling at the workplace. New York: McGraw-Hill.

Chicago

Hill Norman C, . 1981. Counseling at the workplace. New York: McGraw-Hill.

Harvard

Hill N. C., . (1981). Counseling at the workplace. New York: McGraw-Hill.

MLA

Hill Norman C, . Counseling at the workplace. New York: McGraw-Hill. 1981.