Ramo, Simon
Hill and Wang, 1988
Buku Teks
Hirsch, Julius, author
Harper & Brothers, 1955
Buku Teks
Fels, Rendings
The University of North Carolina Press, 1959
Buku Teks
Kadish, Jules E., author
Artech House , 1993
Buku Teks
Clark, John M., author
National Bureau of Economic Resesarch, 1934
Buku Teks