New York Qxford University Press 1985,
Buku Teks
Martinus Nijhoff , 1990
Buku Teks
Manchester University Press , 1995
Buku Teks
selected, edited and introduced by Rudolf Schlesinger ; translated by W.W. Gottlieb
Routledge & Kegan Paul , 1956
Buku Teks
Cornell University Press, 1975
Buku Referensi