Waterston, Albert, author
John Hopkins University Press, 1969
Buku Teks
Oberschall, Anthony, author
Sage, 2004
Buku Teks
Midgley, James, author
Sage publications, 1995
Buku Teks
edited by Gove Hambidge ; foreword by Teodoro Moscosco, introd. by Paul G. Hoffman
Frederick A. Praeger, 1964
Buku Teks
edited by B.S. Hoyle
John Wiley & Sons, 1978
Buku Teks