Clark, John M., author
National Bureau of Economic Resesarch, 1934
Buku Teks
Achinstein, Asher, author
Thomas Y. Crowell, 1950
Buku Teks
Bratt, Elmer C., author
Richard D. Irwin, 1953
Buku Teks
Dauten, Carl Anton, 1913-, author
South-Western Publishing, 1978
Buku Teks
Valentine, Lloyd M., author
South-Western Publishing, 1991
Buku Teks