Mendelson, Wallace, author
Dorsey Press, 1980
Buku Teks
Abraham, Henry J., author
Oxford University Press, 1968
Buku Teks
Bartholomew, Paul C., author
W.M.C. Brown, 1951
Buku Teks
Gellhorn, Walter, author
Macmillan, 1961
Buku Teks
Jensen, Merrill, author
Kriger, 1979
Buku Teks