Metz, Harold W.
The Brookings Institution, 1945
Buku Teks
Daugherty, Carrol R., author
Houghton Mifflin, 1952
Buku Teks
Hanslove, Kurt L.
Cornell University , 1967
Buku Teks
Bennet-Alexander, Dawn, author
Irwin/McGraw-Hill, 2004
Buku Teks
Edited by Matthew W. Finkin, Guy Mundlak
Edward Elgar Publishing, In, 2015
Buku Teks