Dale, Ernest, author
The great organizers
McGraw-Hill, 1969
 Buku Teks
Breyfogle, Forrest W., author
Managing six sigma
John Wiley & Sons, 2001
 Buku Teks
Everyman's encyclopaedia : volume six
edited by E. F. Bozman
J. M. Dent & Sons, 1958
 Buku Referensi
English for today. Book six
McGraw-Hill, 1964
 Buku Teks
Ellroy, James, author
The Cold six thousand
Arrow, 2001
 Buku Teks
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