Malone, Michael S.
McGraw-Hill, 2010
Buku Teks
Klingenberg, Joseph J.
Reinhold Publishing & Co., 1965
Buku Teks
edited by William Wels
Lippincott Williams & Wilkins, 2003
Buku Teks
Berges, Steve
American Management Association, 2006
eBooks
Goncalves, Marcus
McGraw-Hill , 2000
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