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              WELLMAN, B.; GULIA, M. Virtual communities as communities: net surfers don't ride alone. In: KOLLOCK P.; SMITH, M.(Org.). Communities in Cyberspace. New York: Routledge, 1999.
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              Wellman, B. & M. Gulia (1999), 'Net surfers don't ride alone: Virtual communities as communities', in B. Wellman (ed.), Networks in the Global Village, 331-367. Boulder: Westview Press.
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              Wellman, Barry; Gulia, Milena 1999: Net Surfers don't Ride Alone: Virtual Communities as Communities. In: Wellman, Barry (Hg.): Networks in the Global Village. Boulder, CO: Westview, S. 331- 367.
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