Nugent, Frank A., 1921-
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Buku Teks SO
Neukrug, Edward S.
Brooks/Cole Cengage Learning, 2012
Buku Teks SO
Rogacion, Mary
Kanisius , 1996
Buku Teks SO
Hackney, Harold
Allyn and Bacon, 2000
Buku Teks SO
Nelson-Jones, Richard
Sage Publications, 2004
Buku Teks