Freund, Paul A.
Harvard University Press, 1974
Buku Teks
Ross, Alf
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
Auerbach, Jerold S.
Oxford University Press, 1983
Buku Teks