Davis, J. B.
Petroleum microbiology / B. J. Davis
Elsevier, 1967
 Buku Teks SO
Harker, Ralph J.
Generalized methods of vibration analysis / Ralph J. Harker
John Wiley & Sons, 1983
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Cordiner, Ralph J.
New frontiers for professional managers / Ralph J. Cordiner
McGraw-Hill Book Company, Inc., 1956
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Davis, Joel, 1950-
Advertising research : theory and practice / Joel J. Davis
Prentice-Hall, 1997
 Buku Teks SO
Davis, Robert J.
Digital and computer projects / Robert J. Davis
Newnes, 1999
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