Isaacs, Asher, 1902-1963, author
Dryden Press, 1952
Buku Teks
Harriss, C. Lowell (Clement Lowell), 1912-2009, author
Prentice-Hall, 1967
Buku Teks
edited by Kurt W. Rothschild
Penguin Books, 1971
Buku Teks
Kohler, Heinz, author
Alfred A. Knoff , 1961
Buku Teks
edited by Paul A. Samuelson
McGraw-Hill, 1970
Buku Teks