1. A further look at the equilibrium theory: Visual interacton as a function of interpersonal distance;Aiello;Environmental Psychology and Nonverbal Behavior,1977
2. The Environment and Social Behavior: Privacy, Personal Space, Territory and Crowding;Altman,1975
3. DSM-III: Diagnostic and Statistical Manual of Mental Disorders;American Psychiatric Association,1980
4. Eye contact, distance and affiliation;Argyle;Sociometry,1965
5. Kinesis and Context;Birdwhistell,1970