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