edited by Edward Dumbauld
Liberal Arts Press, 1955
Buku Teks
Robinson, Marguerite S.
Cambridge University Press, 1975
Buku Teks
Anastasiou, Michaelangelo
Routledge, 2020
Buku Teks
School of History, Politics and Strategic Studies. Faculty of Social Science and Humanities, University Kebangsanan Malaysia, 2004
Majalah, Jurnal, Buletin
Harmon, M. Judd
McGraw-Hill, 1964
Buku Teks