Ross, Alf, author
Stevens & Sons Limited, 1958
Buku Teks
Freund, Paul A., author
Harvard University Press, 1974
Buku Teks
Ross, Alf, author
University of California Press, 1959
Buku Teks
Weinreb, Lloyd L.
Harvard University Press, 1987
Buku Teks
Febleman, James K.
Martinus Nijhoff Publushers, 1985
Buku Teks