Kitchen, Martin
Blackwell Pub, 2012
Buku Teks
Croce, Benedetto
Allen & Unwin, 1953
Buku Teks
Morsey, Rudolf
R. Oldenbourg Verlag, 1995
Buku Teks
Taylor, Alan John Percivale, 1906-1990
London Routledge 2001,
Buku Teks
Gooch, G.P.
Beacon Press, 1968
Buku Teks