found: Work cat.: Caplow, T. Two against one : coalitions in triads, 1968:pp. 1-2 (A triad is a social system containing three related members in a persistent situation ... The members of a triad need not be single persons. They may be three collectivities each acting as a unit ... The triad is the only social group that has an equal number of members and relationships)
found: Brym, R.J. Sociology, 2006:p. 484 (Triad: a social relationship among three nodes, or social units (e.g., people, firms, organizations, countries, etc.))
found: Degenne, A. Introducing social networks, 1999:p. 119 (A triad is a social system of durable links among three elements, persons, or groups)
found: The Blackwell encyclopedia of sociology, 2007:v. 3, p. 1264 (a triad is a social group composed of three members)
found: Clinical sociology review, 1989:p. 106 (Societies as well as groups or institutions can be thought of as participants in triads)