APA (7 वां संस्करण) प्रशस्ति पत्र

BLUMENTHAL, J. C. (1973). English 2600: A programed course in grammar and usage.-- Ed. 4. Harcourt Brace Jovanovich.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

BLUMENTHAL, Joseph C. English 2600: A Programed Course in Grammar and Usage.-- Ed. 4. New York: Harcourt Brace Jovanovich, 1973.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

BLUMENTHAL, Joseph C. English 2600: A Programed Course in Grammar and Usage.-- Ed. 4. Harcourt Brace Jovanovich, 1973.