Field, G. Lowell, author
Cornell University Press, 1967
Buku Teks
Fried, Robert C., author
Macmillan, 1968
Buku Teks
Hague, Rod., author
Palgrave Macmillan , 2013
Buku Teks
Sargent, Lyman Tower, author
Cole Publishing, 1990
Buku Teks
Koopmans, Tim, author
Cambridge University Press, 2003
Buku Teks