Jensen, Merrill, author
Kriger, 1979
Buku Teks
Nauze, J.A. La
Melborne University Press,, 1972.
Buku Teks
Mendelson, Wallace, author
Dorsey Press, 1980
Buku Teks
Gellhorn, Walter, author
Macmillan, 1961
Buku Teks
Bartholomew, Paul C., author
W.M.C. Brown, 1951
Buku Teks