Sawer, Geoffrey, 1910-1996, author
Melbourne University Press, 1973
Buku Teks
Tucker, William P.
University of Minnesota Press, 1958
Buku Teks
Schmidt, Steffen W., author
Wadsworth, 2009
Buku Teks
Crisp, L. F. (Leslie Finlay), author
Longman Chesire, 1965
Buku Teks
Lucy, Richard, author
Macmillan, 1985
Buku Teks