Friedrich, Carl J.
Blaisdell, 1949
Buku Teks SO
Beaumont, Elizabeth
Oxford University Press, 2014
Buku Teks SO
Zurn, Christopher F.
Cambrigde University Press , 2009
Buku Teks
Cambridge University Press, 2019
eBooks
edited by Dov Ronen
Lynne Rienner, 1986
Buku Teks SO