Jones, Howard Mumford
Harvard University Press, 1964
Buku Teks SO
Britton, James N.
Cassell Educational Limited, 1993
Buku Teks SO
edited by Robert DeMaria and Robert D. Brown
Blackwell, 2007
Buku Teks SO
Harris, J. Gordon
The Haworth Press, 2008
Buku Teks SO
Ahern, Barnabas M.
Fides, 1963
Buku Teks SO