Abrahamson, Mark
Prentice-Hall, 1980
Buku Teks SO
Mann, Peter H.
Humanities Press, 1965
Buku Teks
Jan Lin; Christopher Mele
Routledge, 2005
Buku Teks
edited by Ronan Paddison
Sage Publications, 2001
Buku Referensi
Bish, Robert L.
McGraw-Hill Kogakusha, 1975
Buku Teks SO