APA (7th ed.) Citation
GRIGSON, P., & ET AL. (1991). HAND-TAPPER III: A PROTOTYPE COMMUNICATION DEVICE USING FINGER-SPELLING.
Chicago Style (17th ed.) Citation
GRIGSON, P., and ET AL. HAND-TAPPER III: A PROTOTYPE COMMUNICATION DEVICE USING FINGER-SPELLING. 1991.
MLA (9th ed.) Citation
GRIGSON, P., and ET AL. HAND-TAPPER III: A PROTOTYPE COMMUNICATION DEVICE USING FINGER-SPELLING. 1991.
Warning: These citations may not always be 100% accurate.