Montgomery, David, author
Cambridge University Press, 1979
Buku Teks
Bloomsbury Academic, 2014
Buku Teks
by Mark Elvin ... [et al.]
Institute of Advanced Studies, Australian National University, 1994
Buku Referensi
Herling, John
Robert B. Luce, Inc., 1964
Buku Teks
Dudden, Arthur Power, 1921-, author
University of Pennsylvania Press, 1963
Buku Teks SO