Gardiner, Patrick
Oxford University Press, 1952
Buku Teks
O`hear, Anthony, author
Clarendon Press, 1997
Buku Teks
Gardiner, K. H. J.
The Australian National university Press, , 1969
Buku Teks
Reynolds, Charles, author
Martin Robertson, 1973
Buku Teks
Boudon, Raymond
Presses Universitaires de France, 1971
Buku Teks