Rotzoll, Kim B.
GRID Publishing, 1976
Buku Teks
Arnold, Alvin L.
Warren, Gorham & Lamnont, 1981
Buku Teks
Osgood, Charles E. (Charles Egerton)
University of Illinois Press, 1975
Buku Teks
Gaylord, Edwin H. (Edwin Henry), 1903-1998, editor
McGraw-Hill, 1992
Buku Teks
Osgood, Charles E. (Charles Egerton)
University of Illinois Press, 1957
Buku Teks