Robert Frost : a collection of critical essays
edited by James M. Cox
Prentice-Hall, 1962
Buku Teks
Dahl, Curtis
Robert Montgomery Bird /Curtis Dahl
Twayne , 1963
Buku Teks
Day, A. Grove (Arthur Grove), 1904-1994
Robert D. FitzGerald
Twayne, 1974
Buku Teks
Maddux, John L.
The development philosophy of Robert S. McNamara / John L. Maddux
World Bank, 1981
Buku Teks
Fisher, John W.
Fatigue and fracture in steel bridges : case studies / John W. Fisher.
Wiley , 1980
Buku Teks