Dirksen, C. J., & Kroeger, A. (1968). Advertising principles and problems (3rd ed.). R. D. Irwin.
Lua i Stíl Chicago (17ú heag.)Dirksen, Charles J., agus Arthur Kroeger. Advertising Principles and Problems. 3rd ed. Homewood, Ill: R. D. Irwin, 1968.
Lua MLA (9ú heag.)Dirksen, Charles J., agus Arthur Kroeger. Advertising Principles and Problems. 3rd ed. R. D. Irwin, 1968.
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