Taaffe, Robert N
An Atlas Soviet affair / Robert N Taaffe
Frederick A Preager, 1965
Buku Teks SO
Lieb, Robert C.
Transportation / Robert C. Lieb
Reston Publ, 1985
Buku Teks
Ward, Dederick C.
Geologic reference sources : a subject and regional bibliography of publications and maps in the geological sciences / by Dederick C. Ward, Marjorie W. Wheeler & Robert A. Bier, Jr.
Scarecrow Press, 1981
Buku Referensi
Brady, Robert N.
On-higway trucks/Robert N Brady
Reston Publishing Company, 1982
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O`Neill, Robert
Kernel lessons intermediate students book / Robert O'Neill, Roy Kingsbury, and Tony Yeadon
Longman, 1990
Buku Teks SO