Pyle, w. W. (1970). Programmed Learning Aid For Elementary Accounting William W. Pyle. Learning Systems.
Lua i Stíl Chicago (17ú heag.)Pyle, william W. Programmed Learning Aid For Elementary Accounting William W. Pyle. Learning Systems, 1970.
Lua MLA (8ú heag.)Pyle, william W. Programmed Learning Aid For Elementary Accounting William W. Pyle. Learning Systems, 1970.
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