Weinreb, Lloyd L.
Harvard University Press, 1987
Buku Teks
Marshall, H.H.
Sweet & Maxwell Limited, 1959
Buku Teks
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