Crank, John
Oxford Univ. Press , 1962
Buku Teks SO
Peterson, John M.
Prindle, Weber & Schmidt Inc, 1971
Buku Teks SO
Heims, Steve J.
MIT Press , 1980
Buku Teks SO
Russell, Bertrand, 1872-1970, author
George Allen and Unwin, 1956
Buku Teks
Novak, David, author
D.C. Health , 1989
Buku Teks