Weber, Max, 1864-1920, author
Transaction Publishers, 2011
Buku Teks
Robert H. Binstock, Linda K. George, editor
Elsevier , 2011
Buku Teks
Harcourt, Brace & World, 1970
Buku Teks
Webster, Murray, editor
Academic Press, 2014
eBooks
Stebbins, Robert A., author
Sage, 2001
Buku Teks