Wallbank, T. Walter, author
Scott, Foresman, 1965
Buku Teks
Woolley, Leonard
Penguin Books , 1965
Buku Teks
edited by Barry B. Baker
The Haworth Press, 1993
Buku Teks
Seefeldt, Jurgen, author
georg Olms Verlag, 2007
Buku Teks
Seefeld, Jurgen , author
G. Olms, 2011
Buku Teks