Hafer, C. R. (1989). Electronics engineering for professional engineers' examinations (2nd ed.). McGraw-Hill.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHafer, Charles R. Electronics Engineering for Professional Engineers' Examinations. 2nd ed. New York: McGraw-Hill, 1989.
एमएलए (9वां संस्करण) प्रशस्ति पत्रHafer, Charles R. Electronics Engineering for Professional Engineers' Examinations. 2nd ed. McGraw-Hill, 1989.
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