Stillman II, Richard, author
Thomson, 2004
Buku Teks
Salner, Richard
Otto Harrassewitza, 1969
Buku Referensi
Zhonghua Book Company,
Buku Teks
Katz, Jerome A., author
McGraw-Hill Irwin, 2014
Buku Teks
Bausch, K. Richard
Gunter Narr, 972
Buku Referensi