O`Donnell, Cyril, author
The Strategy of corporate research : a symposium
Chandler, 1967
 Buku Teks
Cooper, Donald R., author
Business research methods
McGraw-Hill, 1998
 Buku Teks
Miller, David W., author
Executive decisions and operations research
Prentice-Hall of India, 1973
 Buku Teks
Miller, David W., author
Executive decisions and operations research
Prentice-Hall, 1960
 Buku Teks
Davis, Duane
Business research for decision making/ Duane Davis and Robert M. Cosenza
Wadsworth , 1993
 Buku Teks
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