Arrow, Kenneth J., author
John Wiley & Sons, 1951
Buku Teks
Algie, Jimmy
kogan page, 1975
Buku Teks
Harcourt, Brace & World, 1970
Buku Teks
Reamer, Frederic G., author
Columbia University Press, 1999
Buku Teks
Arrow, Kenneth J., author
Yale University Press, 1963
Buku Teks