Horgan, John, author
Phoenix, 2000
Buku Teks
Alan L. Carsrud, Malin Brannback, editors
[Springer , ], 2012
eBooks
Reynolds, Charles, author
Martin Robertson, 1973
Buku Teks
Boudon, Raymond
Presses Universitaires de France, 1971
Buku Teks
Harre, R.
Littlefield, Adams, 1972
Buku Teks