Thomas Cable
Prentice-Hall, 1993
Buku Teks
edited by W.F. Bynum and Roy Porter
Routledge, 1993
Buku Referensi
editor, W.F. Bynum, Roy Porter
Routledge, 1993
Buku Referensi
Cook, Chris, author
Routledge, 2005
Buku Teks
Merken, Melvin, author
Saunders College Publishing, 1993
Buku Teks