Hambro, Edvard
A.W. Sythoff, 1963
Buku Teks
edited by Beth A. Simmons and Richard H. Steinberg
Cambridge University Press, 2006
Buku Teks
Shaw, Malcolm Nathan, 1947-
Cambridge University Press, 2017
Buku Teks
Fenwick, Charles G.
Appleton-Century-Crofts, 1948
Buku Teks
Schwarzenberger, Georg
Stevens & Sons, 1949
Buku Teks