Kaliski, Burton S.
Harcourt Brace Jovanovich, 1982
Buku Teks
Whitehead, Alfred North, 1861-1947, author
Oxford University Press, 1969
Buku Teks
Young, Frederick H., author
John Wiley & Sons, 1968
Buku Teks
Russell, Bertrand, 1872-1970, author
George Allen and Unwin, 1956
Buku Teks
Novak, David, author
D.C. Health , 1989
Buku Teks