edited by Mivhael D. Myers, David Avison
Sage, 2002
Buku Teks
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Gorman, G.E.
Facet Publishing, 2005
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Clive, Seale, Giampietro Gobo, Jaber F. Gubrium, David Silverman
Sage Publications, 2008
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Gummesson, Evert
Sage Publications, Inc., 2000
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