compiled and edited by William L. Langer
Houghton Mifflin, 1968
Buku Referensi
Saunders, Anthony, author
McGraw-Hill, 1997
Buku Teks
edited by Mark Beaumont
Brill, 2018
eBooks
Verma, H. C.
Naya Prokash, 1978
Buku Teks
Quigley, John
Ohio State University Press, 1974
Buku Teks