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
Burke, T. Patrick, author
Blackwell, 2005
Buku Teks
Spilka, Bernard., author
The Guilford press, 2003
Buku Teks