Russell, Bertrand, 1872-1970
George Allen and Unwin, 1956
Buku Teks
Smith, Karl J.
Brooks/Cole, 1973
Buku Teks
Hafstrom, John E.
Addison-Wesely, 1961
Buku Teks
Sharp, Henry
Prentice-Hall, 1968
Buku Teks
Keedy, Mervin J.
Addison-Wesley , 1969
Buku Teks