Cline, William R., author
Praeger, 1972
Buku Teks
American Enterprise Institute for Public Policy Research, 1977
Buku Teks
American Economic Association
Richard D. Irwin, 1951
Buku Teks
Peacock, Lan T.
Jonathan , 1954
Buku Teks
Miller, Herman Phillip, author
John Wiley & Sons, 1955
Buku Teks