1. Aiello, J.R., De Risi, D.T., Epstein, Y.M. & Karlin, R.A. (1977). Crowding and the role of interpersonal distance preference. Sociometry, 40, 271–281.
2. Altman, I. (1975). The Environment and Social Behavior: Privacy, Personal Space, Territory, Crowding. Monterey: Brooks/Cole.
3. Altman, I. (1979). Privacy as an interpersonal boundary process. In M. von Cranach, K. Foppa, W. Lepenies & D. Ploog (eds.), Human Ethology: Claims and Limits of a New Discipline, pp. 95–132. Cambridge: Cambridge University Press.
4. Altman, I. & Vinsel, A.M. (1977). Personal space: an analysis of E.T. Hall’s proxemics framework. In I. Altman & J.F. Wohlwill (eds.), Human Behavior and Environment: Advances in Theory and Research, Volume 2, pp. 181–259. New York: Plenum Press.
5. Argyle, M. & Dean, J. (1965). Eye contact, distance and affiliation. Sociometry, 28, 289–304.