edited by John Herman Randali, Justus Buchler
Barnes & Noble, 1950
Buku Teks
Johnson, James T., author
South-Western Publishing, 1960
Buku Teks
Johnson, James T., author
South-Western Publishing, 1965
Buku Teks
edited by James L. Gibson
Tex Business Publications , 1982
Buku Teks
Westing, John Howard, author
Prentice-Hall, 1957
Buku Teks