Hartman, R. R. (1976). Graphics For Designers A Studio Workbook Robert R. Hartmann. The IOWA State University.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHartman, Robert R. Graphics For Designers A Studio Workbook Robert R. Hartmann. The IOWA State University, 1976.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHartman, Robert R. Graphics For Designers A Studio Workbook Robert R. Hartmann. The IOWA State University, 1976.
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