Yasushi Watanabe
Elgar, 2018
Buku Teks
German-Grapes, Joan, author
Probus Publishing Company, 1994
Buku Referensi
edited by Peter S. Hopf
McGraw-Hill, 1979
Buku Referensi
Yang, Hu, 1980-, author
China Intercontinental Press, 2010
Buku Teks
Herbert, Anthony B.
Macmillan Publishing Co., 1983
Buku Teks