edited by Charles Peters and Jonathan Alter
Prentice-Hall, 1985
Buku Teks
Barlow, Linda
Doubleday , 1988
Buku Teks
Fortune
McGraw-Hill, 1956
Buku Teks
Korda, Michael, 1933-
Summit Books, 1989
Buku Teks
Ludwig, Emil, 1881-1948, author
Garden City Publishing, 1941
Buku Teks