Lewes, George Henry, author
Cambridge University Press, 2013
eBooks
edited by John Henry Raleigh
Holt, Rinehart and Winston, 1962
Buku Teks
Russell, Bertrand, 1872-1970, author
George Allen and Unwin, 1957
Buku Teks
Russel, Bertrand, author
Routledge, 1948
Buku Teks
Siddiqui, Naseeb Ahmed, author
UIN Ar-Raniry , 2017
Artikel Jurnal