Pyle, w. W. (1970). Programmed Learning Aid For Elementary Accounting William W. Pyle. Learning Systems.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPyle, william W. Programmed Learning Aid For Elementary Accounting William W. Pyle. Learning Systems, 1970.
एमएलए (8वां संस्करण) प्रशस्ति पत्रPyle, william W. Programmed Learning Aid For Elementary Accounting William W. Pyle. Learning Systems, 1970.
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