Hirst, J.B.
George Allen and Unwin, 1983
Buku Teks
Horwitz-Grahame, 1965
Buku Teks
Robson, L.L., author
Cambridge University Press, 1976
Buku Teks
Melbourne, A. C. V.
University of Queensland Press, 1963
Buku Teks
William Miller, Rita Pellen, editor
Routledge, 2009
Buku Teks