Veblen, Thorstein
Hill and Wang , 1965
Buku Teks
edited by Richard Hofstadter and Wilson Smith
University of Chicago Press, 1961
Buku Teks
Schlossberg, Nancy K.
Jossey-Bass Publishers, 1989
Buku Teks
American Council on Education, 1964
Buku Teks
DeVane, William Clyde, author
Harvard University Press, 1965
Buku Teks