edited by Kurt W. Rothschild
Penguin Books, 1971
Buku Teks
edited by Nicole Woosley Biggart
Blackwell, 2002
Buku Teks
Kohler, Heinz, author
Alfred A. Knoff , 1961
Buku Teks
edited by Paul A. Samuelson
McGraw-Hill, 1970
Buku Teks
Hailstones, Thomas J., author
South-Western Publishing, 1974
Buku Teks