Sidhu, Gursharan S., author
Addison-Wesley, 1990
Buku Teks
edited by Charles Peters and James Fallows ; foreword by Richard H. Rovere
Frederick A. Praeger, 1976.
Buku Teks
Kelly, Gery F., author
McGraw-Hill, Higher Education, 2008
Buku Teks
Steele, James, author
Phaidon Press, 1997
Buku Teks
Buckley, Roger, author
Cambridge University Press, 1990
Buku Teks