Cole, Kris
Elex Media Komputindo, 1997
Buku Teks
Gamble, Teri Kwal, author
Random House, 1983
Buku Teks
Hybels, Saundra, author
D. Van Nostrand, 1974
Buku Teks
Bormann, Ernest G., author
Harper & Row, 1965
Buku Teks
Ida Ayu Puspa Cindra Rini, author
2017
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