Kleppner, O., Lane, W. R., Russell, T., & Verrill, G. (1988). Otto Kleppner's advertising procedures (10th ed.). Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Kleppner, Otto, W. Ronald Lane, Thomas Russell, agus Glenn Verrill. Otto Kleppner's Advertising Procedures. 10th ed. Englewood Cliffs, N.J: Prentice Hall, 1988.
Lua MLA (9ú heag.)Kleppner, Otto, et al. Otto Kleppner's Advertising Procedures. 10th ed. Prentice Hall, 1988.
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