Carolyn Kagan, Mark Burton, Paul Duckett, Rebecca lawthom, Asiya Siddiquee
BPS Blackwell, cop, 2011
Buku Teks
Robbins, Paul
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Buku Teks
Giddens, Anthony
Harcourt, Brace Javanovich, 1982
Buku Teks
Ward, Ian
Routledge. Cavendish. Taylor & Francis Group, 2004
Buku Teks
Sole, Mary Lou
Elsevier , 2005
Buku Teks