Broom, Leonard
Harper & Row , 1963
Buku Teks
Mannheim, Hermann, author
Routledge & Kegan Paul, 1973
Buku Teks
Casner, A. James, author
Little, Brown and Company, 1969
Buku Teks
Leifer, Gloria, author
Elsevier Mosby, 2012
Buku Teks
Miller, Roger LeRoy, author
South Western Cengage Learning, 2011
Buku Teks