edited by George R. Creeger and Joseph W. Reed, Jr.
Holt, Rinehart and Winston, 1964
Buku Teks
Stafford, Fiona
Wiley Blackwell, 2012
Buku Teks
Fischer, Hermann
Cambridge University Press, 1991
eBooks
edited with introduction by David Wright
Penguin Books, 1982
Buku Referensi
At The Clarendon Press, 1921
Buku Teks