edited by Richard H. Egdahl and Diana Chapman Walsh
Springer-Verlag, 1978
Buku Teks
Starke, J.G., author
Melbourne University Press, 1965
Buku Teks
Osgood, Robert Endicott, author
The University Chicago Press, 1962
Buku Teks
Huntley, James R., author
NATO Information Service, 1972
Buku Teks
Artikel Jurnal