Heragu, Sunderesh S.
Sunderesh S., 2016
Buku Teks SO
Press, Frank
W.H. Freeman and Company, 1986
Buku Referensi
Wright, Samson
Oxford University Press, 1931
Buku Referensi
Weston, Paul B.
Prentoce-Hall, 1981
Buku Teks SO
Mott, Robert L.
Pearson Prentice Hall, 2006
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