Handfield, Robert B.
Introduction to supply chain management/Robert B. Handfield dan Ernest L. Nichol, JR.
Prentice-Hall, 1999
Buku Teks
Steidel, Robert F.
An Introduction to mechanical vibrations/Robert F. Steidel, JR
John Wiley & Sons, 1989
Buku Teks
Dodd, J. Robert
Paleoecology: concepts and applications/ J. Robert Dodd, Robert J. Stanton, Jr
John Wiley & Sons, 1990
Buku Teks
Ekelund, Robert B. Jr
Economics/ Robert B. Ekelund, Jr. , Robert D. Tollison
Little, Brown & Co., 1986
Buku Teks
Collier, Abram T.
Management, men and valees
Harper & Row, 1962
Buku Teks