Wiley-Blackwell, 2010
Buku Teks
edited by Nigel Cross, David Elliott and Robin Roy
Hutchinson Educational , 1974
Buku Teks
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