BOTT, E. (1957). Family and social network. London: Tavistock Publications .
2.
CARTWRIGHT, D. & HARARY, F. (1956). Structural balance: a generalization of Heider's theory . Psychol. rev.63, 277-292 .
3.
DAVIS, J. (1963). Structural balance, mechanical solidarity, and interpersonal relations . Amer. J. sociol.68, 444-462 .
4.
FLAMENT, C. (1963), Applications of graph theory to group structure. Englewood Cliffs, N.J.: Prentice-Hall .
5.
HARARY, F. (1955-6). On the notion of balance of a signed graph . Mich. math. J.2, 143-146 .
6.
HARARY, F. , NORMAN, R. & CARTWRIGHT, D. (1965). Structural models. New York: Wiley .
7.
HEWER, F. (1958). The psychology of interpersonal relations. New York: Wiley .
8.
HOMANS, G. (1950). The human group. New York: Harcourt, Brace .
9.
RAPOPORT, A. (1963). Mathematical models of social interaction. In R. Luce , R. Bush and E. Galanter (Eds.), Handbook of mathematical psychology, Vol. II. New York: Wiley , pp. 493-579.