Westview Press, 1978
Buku Teks
edited by Franklin D. Margiotta, James Brown, and Michael J. Collins
Westview Press, 1983
Buku Teks
Edwards, Paul M.
Paul M. Edwards, 2006
Buku Referensi
Potts, E. Daniel
Oxford University Press, 1985
Buku Teks SO
edited by David Curtis Skaggs and Robert S. Browning III
Wadsworth, 1991
Buku Teks SO