Corrigan, Paul, author
Bhuana Ilmu Populer, 1999
Buku Teks
Doren, Mark van, author
Doubleday , 1955
Buku Teks
Goddard, Harold C., author
Phienix Books, 1990
Buku Teks
edited by J.V. Cunningham
Fawcett Publications, 1970
Buku Teks
Mcevoy, Sean, author
Routledge, 2006
Buku Teks