Smithies, Arthur
McGraw-Hill, 1955
Buku Teks
Kimmel, Lewis H.
The Brookings Institution, 1959
Buku Teks
Browne, Vincent J., author
Public Affairs Press, 1949
Buku Teks
edited by Roy A. Grisham, Jr., Paul D. McConaughy
WM. H. Wise, 1966
Buku Referensi
Maxwell, James A., author
Harvard University Press, 1946
Buku Teks