Bois, W.E.B. Du
Harcourt, Brace and Company, 1945
Buku Teks
Paris, Roland, author
Cambridge University Press, 2004
Buku Teks
Brandt, Willy, author
Verlag Neue Gesellschaft , 1971
Buku Teks
Pauling, Linus, author
Jones and Bartlett Publishers, 2009
Buku Teks
Krieger, David, author
Middleway Press, 2002
Buku Teks