edited by Catherine Gowthorpe and John Blake
Routledge , 1998
Buku Teks
Westview Press , 1989
Buku Teks
edited by James Hastings
New York Charles Scribner's Sons 1961
Buku Referensi
Wasserman, Barry, author
John Wiley & Sons, 2000
Buku Teks
Morishima, Michio
Oxford Clarendon Press 1969,
Buku Teks