Gaya APA

Spiro, R, L, ;, R, G, A, ;, S, W, J. (2008). Management of a sales force, 12th ed. . New York: McGraw-Hill.

Gaya MLA

Spiro, Rosann, L., ;, Rich,, Gregory, A., ;, Stanton,, William, J.. "Management of a sales force, 12th ed.". New York: McGraw-Hill, 2008. Text.