Alden, John Richard, author
Harper & Row Publishers, 1963
Buku Teks
Bartholomew, Paul C., author
W.M.C. Brown, 1951
Buku Teks
Wilson, James Q., author
D.C. Heath, 1995
Buku Teks
Friedman, Lawrence M., 1930-, author
Tatanusa, 2001
Buku Teks
Hallenbeck, Wilbur C., author
Harper & Brothers , 1951
Buku Teks