Wallace, Walter L.
Aldine Publishing Company, 1971
Buku Teks
Boolos, George, author
Harvard University Press, 1998
Buku Teks
Cambridge University Press, 1997
eBooks
Allwood, Jens
Cambridge University Press, 1995
Buku Teks
Copi, Irving M., author
Macmillan, 1961
Buku Teks