Wang, Jianping
Curzon, 2001
Buku Referensi
Khan, Muhammad Akram
Routledge, 2003
Buku Referensi
Merriam-Webster, 1995
Buku Referensi
Houghton Miffiln, 1981
Buku Referensi
editors, Gerald P. Koocher, John C. Norcross, Sam S. Hill, III
Oxford University Press, 2005
Buku Teks