Welsch, G. A. (1970). Cases in profit planning and control. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Welsch, Glenn A. Cases in Profit Planning and Control. Englewood Cliffs, N.J.: Prentice-Hall, 1970.
Lua MLA (8ú heag.)Welsch, Glenn A. Cases in Profit Planning and Control. Prentice-Hall, 1970.
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