Nonverbal Behaviors, Persuasion, and Credibility - BURGOON, JUDEE K. and BIRK, THOMAS and PFAU, MICHAEL (Human Communication Research, 1990)
https://katalog.adlr.link/Record/ai-49-aHR0cDovL2R4LmRvaS5vcmcvMTAuMTExMS9qLjE0NjgtMjk1OC4xOTkwLnRiMDAyMjkueA