Burgoon, J. K.; Jones, S. B. «Toward a Theory of Personal Space Expectations and Their Violations». Human Communication Research, 2, 2, 1976, pàg. 131–146. DOI: 10.1111/j.1468-2958.1976.tb00706.x.
Burgoon, J. K.; Hale, J. L. «Nonverbal Expectancy Violations: Model Elaboration and Application to Immediacy Behaviors». Communication Monographs, 55, 1988, pàg. 58–79. DOI: 10.1080/03637758809376158.
Hess, Eckhard H.; Polt, James M. «Pupil Size as Related to Interest Value of Visual Stimuli». Science, 132, 3423, 1960, pàg. 349–50. DOI: 10.1126/science.132.3423.349. PMID: 14401489.
Hess, Eckhard H.; Polt, James M. «Pupil Size as Related to Interest Value of Visual Stimuli». Science, 132, 3423, 1960, pàg. 349–50. DOI: 10.1126/science.132.3423.349. PMID: 14401489.