Kerin, R. A., & Peterson, R. A. (1987). Strategic marketing problems: Cases and comments (4th ed.). Allyn and Bacon.
Lua i Stíl Chicago (17ú heag.)Kerin, Roger A., agus Robert A. Peterson. Strategic Marketing Problems: Cases and Comments. 4th ed. Boston: Allyn and Bacon, 1987.
Lua MLA (9ú heag.)Kerin, Roger A., agus Robert A. Peterson. Strategic Marketing Problems: Cases and Comments. 4th ed. Allyn and Bacon, 1987.
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