Burke, T. Patrick
Blackwell, 2005
Buku Teks
edited by Stewart Sutherland, Leslie Houlden, Peter Clarke, Friedhelm Hardy
Routledge, 1988
Buku Referensi
Gar, Joseph
Dodd, Mead, 1963
Buku Teks
Gaer, Joseph
Dodd, Mead, 1956
Buku Teks
Ewing, J.H., editor
Dell Publishing, 1964
Buku Teks