Ranny, Austin
Governing
Prentince-Hall, 1987
 Buku Teks
Conflict and consensus in modern American history
edited by Allen F. Davis and Harold D. Woodman
D.C. Health, 1984
 Buku Teks
Coyle, David Cushman, 1887-1969
Concervation : an American story of conflict and accomplishment
Rutgers UNiversity Press, 1957
 Buku Teks
Cuber, John F
Problems of American society: values in conflict
Henry Holt And Company, 1951
 Buku Teks
Conflict and consensus in early American history
edited by Allen F. Davis and Harold D. Woodman
D.C. Heath, 1984
 Buku Teks