De Vries, Mary Ann, author
Prentice-Hall, 1991
Buku Referensi
Dany, Max, author
Hachette , 1977
Buku Teks
Jennings, Lucy Mae
Prentice-Hall, 1983
Buku Teks
Diehl, Marcy Otis, author
Elsevier Saunders, 2012
Buku Teks
Stroman, James, author
American Management Association, 2008
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