Lamparello, Adam, author
NY Routledge, 2017
Buku Teks
Longaker, Richard P.
Cornell University Press, 1962
Buku Teks
Schubert, Glendon, author
Scott, Foresman, 1965
Buku Teks
Pacelle, Richard L., Jr.
Westview Press, 1991
Buku Teks
Jacob, Herbert, 1933-, author
Litle, Brown, 1978
Buku Teks