Grossman, Charles J., author
Sulzburger & Graham, 1995
Buku Teks
Bainbridge, F.A., author
Longmans, Green , 1919
Buku Teks
edited by R. G. M. Morris
Clarendon Press, 1989
Buku Referensi
Mosby, 1996
Buku Teks
Fox, Ira Stuart, author
McGraw-Hill, Higher Education, 2009
Buku Teks