Carlson, Richard, 1961-, author
Harper, 1997
Buku Teks
Bianco-Mathis, Virginia E.
Sage, 2002
Buku Teks
Cobb, Stephen, author
Osborne McGraw-Hill, 1992
Buku Teks
by Delbert S. Elliott ...[et al.]
Cambridge University Press, 2007
Buku Teks
Pakpahan, Donna Irma Rumondang, author
2019
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