Mason, Stephen S.
Henry Schuman, 1953
Buku Teks SO
Leahey, Thomas Hardy
Prentice-Hall, 1997
Buku Teks SO
Quint, Howard H
Dorsey Press, 1968
Buku Teks
Aron, Raymond, 1905-1983
Basic Books, 1965
Buku Teks SO
Short, Raymond W.
Henry Holt and Company, 1954
Buku Teks SO