Olmstead, Clifton E., author
Prentice-Hall, 1960
Buku Teks
Russell, Bertrand, 1872-1970, author
George Allen and Unwin, 1957
Buku Teks
Russel, Bertrand, author
Routledge, 1948
Buku Teks
Medhurst, Walter Henry
Crocker & Brewster, 1838
Buku Teks
Zeller, Eduard, 1814-1908, author
Meridian Books, 1960
Buku Teks