Achinstein, Asher, author
Thomas Y. Crowell, 1950
Buku Teks
Hald, Earl C., author
Houghton-Mifflin, 1954
Buku Teks
Bowers, David A., author
Addison-Wesley, 1985
Buku Teks
Hamberg, Daniel, author
Macmillan, 1951
Buku Teks
Mitchell, Wesley C., author
National Bureau of Economic Research, 1954
Buku Teks