Tyran, M. R. (1992). The Vest-pocket Guide To Business Ratios. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Tyran, Michael R. The Vest-pocket Guide To Business Ratios. Prentice-Hall, 1992.
Lua MLA (8ú heag.)Tyran, Michael R. The Vest-pocket Guide To Business Ratios. Prentice-Hall, 1992.
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