Hutten, Ernest H.
Greenwood Press, 1978
Buku Teks
Keller, Evelyn Fox, author
Yale University Press , 1985
Buku Teks
Taylor, F. Sherwood, author
Frederick A. Praeger, , 1955
Buku Teks
edited by R.C. Olby, G.N. Cantor, J.R.R. Christie and M.J.S. Hodge
Routledge, 1990
Buku Referensi
Ingpen, Robert, author
Dragon's World, 1993
Buku Referensi