Schwartz, Bernard
The Ronald Press, 1957
Buku Teks
Agresto, John
Cornell University Press, 1984
Buku Teks
Clark, Tom S.
Cambridge University Press, 2019
eBooks
University Of Washington Press, 1978
Buku Teks
Rehnquist, William H.
William morrow and company,inc., 1987
Buku Teks