APA (7 वां संस्करण) प्रशस्ति पत्र

Levy, B. N., & Hubbard, . E. (1995). Graphing calculator keystroke guide to accompany the Hubbard/Robinson algebra series. D.C. Heath.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Levy, Benjamin N., और Elaine Hubbard. Graphing Calculator Keystroke Guide to Accompany the Hubbard/Robinson Algebra Series. Lexington, Mass.: D.C. Heath, 1995.

एमएलए (8वां संस्करण) प्रशस्ति पत्र

Levy, Benjamin N., और Elaine Hubbard. Graphing Calculator Keystroke Guide to Accompany the Hubbard/Robinson Algebra Series. D.C. Heath, 1995.