Doe, M., & Warlum M, M. (1988). Business mathematics: A positive approach -- (2nd ed.). West Publishing Co..
Lua i Stíl Chicago (17ú heag.)Doe, Maryann, agus Michael Warlum M. Business Mathematics: A Positive Approach --. 2nd ed. St. Paul: West Publishing Co., 1988.
Lua MLA (9ú heag.)Doe, Maryann, agus Michael Warlum M. Business Mathematics: A Positive Approach --. 2nd ed. West Publishing Co., 1988.
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