Brightman, Edgar Sheffield
Holt, Rinehart and Winston, 1961
Buku Teks
Woodhouse, Mark B., author
Wadsworth, 1984
Buku Teks
Russell, Bertrand, 1872-1970, author
Routledge, 1996
Buku Teks
Patrick, George Thomas White, author
George Allen and Unwin, 1925
Buku Teks
Russell, Bertrand, 1872-1970, author
Oxford University Press, 1912
Buku Teks