Levinson, Paul, author
Routledge, 1977
Buku Teks
Artikel Jurnal
Stout, Linda, author
Berrett-Koehler, 2011
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Wright, Richard T.
Pearson Education, 2002
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[edited by] Michael J. Kavanagh, Mohan Thite, Richard D. Johnson
Sage, 2015
Buku Teks