Patrick, George Thomas White, author
George Allen and Unwin, 1925
Buku Teks
Russell, Bertrand, 1872-1970, author
Oxford University Press, 1912
Buku Teks
Palmer, Donald, author
McGraw-Hill, 2013
Buku Teks
Palmer, Donald, author
McGraw-Hill, 2001
Buku Teks
Ayer, A. J. (Alfred Jules), 1910-1989, author
Penguin Books, 1982
Buku Teks