Silver, Howard A.
Prentice-Hall, 1979
Buku Teks SO
Musser, Gary L.
John Wiley & Sons, 2006
Buku Teks SO
Gothmann, William H.
Prentice-Hall, 1982
Buku Teks
Musser, Gary L.
John Wiley & Sons, 2004
Buku Teks SO
Russell, Bertrand, 1872-1970
George Allen and Unwin, 1956
Buku Teks SO