Bishop, H.M., author
Appleton-Century-Crofts, 1956
Buku Teks
Tavistock Publ., 1978
Buku Teks
Albrecht, Robert L.
John Wiley , 1978
Buku Teks
edited by John Herman Randali, Justus Buchler
Barnes & Noble, 1950
Buku Teks
Johnson, James T., author
South-Western Publishing, 1960
Buku Teks