May, Rollo, 1909-, author
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Buku Teks
Singgih D. Gunarsa, author
Gunung Mulia, 1992
Buku Teks
Hackney, Harold
Allyn and Bacon, 1991
Buku Teks
Worden, J. William, author
Routledge, 1991
Buku Teks
Lubis, Namora Lumongga, author
Kencana Prenada Media Group, 2011
Buku Teks