selected by Henry Steele Commager
American Museum of Natural History, 1964
Buku Teks
edited by Henry Steele Commager
Appleton-Century-Crofts, 1949
Buku Referensi
edited by Richard P. Stebbins
Published for the Council on Foreign Relations by Simon and Schuster, [1939-1970], 1963
Buku Teks
edited by Richard P. Stebbins
American Book-stratford Press, 1963
Buku Teks
edited by Raymond Dennett
World Peace Foundation, 1950
Buku Teks