Weber, Max, 1864-1920
Routledge & Kegan Paul, 1977
Buku Teks
Merrill, Francis E. (Francis Ellsworth), 1904-1969
Prentice-Hall, 1965
Buku Teks SO
Brym, Robert J.
Wadsworth and Cengage Learning, 2013
Buku Teks
Mannheim, Karl
Routledge & Kegan, 1951
Buku Teks SO
Calhoun, Craig J.
McGraw-Hill , 1994
Buku Teks