Kleppner, O., & Govoni, N. A. P. (1988). Advertising procedure (10th ed.). Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Kleppner, Otto, agus Norman A. P. Govoni. Advertising Procedure. 10th ed. Englewood Cliffs, N.J: Prentice-Hall, 1988.
Lua MLA (9ú heag.)Kleppner, Otto, agus Norman A. P. Govoni. Advertising Procedure. 10th ed. Prentice-Hall, 1988.
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