1. Altman, I. (1970) "Territorial behavior in humans: an analysis of the concept," pp. 1-24. in L. A. Pastalan and D. A. Carson (eds.) Spatial Behavior of Older People. Ann Arbor: Univ. of Michigan Press.
2. The ecology of isolated groups
3. — E. Lett ( 1970) "The ecology of interpersonal relationships: a classification system and conceptual model," pp. 177-201 in J. E. McGrath (ed.) Social and Psychological Factors in Stress. New York: Holt, Rinehart and Winston.
4. Ecological Aspects of Group Behavior in Social Isolation1