Crouch, Robert L.
Macroeconomics / Robert L. Crouch
Harcourt Brace Jovanovich , 1972
 Buku Teks SO
Maddex, Robert L.
Constitutions of the world / Robert L. Maddex
Routledge, 1996
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Kan, Robert L.
Unofficial answers to the uniform certified public accountants examination of the American Institute of Accountants Robert L. Kan and Fountaine C. Bradley
\aNew York, N.Y. American Institute of Accountants 1954,
 Buku Teks
Mott, Robert L.
Machine elements in mechanical design / Robert L. Mott
Pearson/Prentice Hall, 2004
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Bailey, Robert L.
Solar-electrics: research and development / Robert L Bailey.
Ann Arbor Science,, 1980
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