Conveying emotion in robotic speech: Lessons learned. - Joe Crumpton; Cindy L. Bethel (RO-MAN, 2014)

Validation of vocal prosody modifications to communicate emotion in robot speech. - Joe Crumpton; Cindy L. Bethel (CTS, 2015)

A Survey of Using Vocal Prosody to Convey Emotion in Robot Speech. - Joe Crumpton; Cindy L. Bethel (Int. J. Soc. Robotics, 2016)