Wolf, Robert Lee
The Balkans in our time
The Norton Library, 1967
 Buku Teks
Wolff, Robert Lee
Nineteenth-century fiction : a bibliographical catalogue based on the collection formed by Robert Lee Wolff : volume I / compiled by Robert Lee Wolff
Garland Publishing, 1981
 Buku Referensi
Wolff, Robert Lee
Nineteenth-century fiction : a bibliographical catalogue based on the collection formed by Robert Lee Wolff : volume IV / compiled by Robert Lee Wolff
Garland Publishing, 1985
 Buku Referensi
Nineteenth-century fiction : a bibliographical catalogue based on the collection formed by Robert Lee Wolff; Volume III
compiled by Robert Lee Wolff
Garland Publishing, 1984
 Buku Referensi
Laski, Harold J.
Reflections on the Revolution of our time
George Allen and Unwin, 1952
 Buku Teks