Arrow, Kenneth J., author
John Wiley & Sons, 1951
Buku Teks
Arrow, Kenneth J., author
Yale University Press, 1963
Buku Teks
Babcock, Chester D., author
Scott, Foresman, 1956
Buku Teks
Algie, Jimmy
kogan page, 1975
Buku Teks
Harcourt, Brace & World, 1970
Buku Teks