Martin, Robert, author
Oxford University Press, 1974
Buku Teks
Conant, James B., author
Harvard University Press, 1958
Buku Teks
Waldo, Dwight, author
Ronald Press, 1948
Buku Teks
Guyer, Paul, author
Cambridge University Press, 2000
Buku Teks
Moscow: Novosti Press, 1977,
Buku Referensi