Learned, Edmund P. (Edmund Philip), 1900-1991, author
Harvard University Press, 1951
Buku Teks
Learned, Edmund P. (Edmund Philip), 1900-1991, author
Andover Press, 1957
Buku Teks
by the editors of Fortune
Doubleday, 1956
Buku Teks
Gerber, Philip L., author
Random House, 1959
Buku Teks
Achua, Christopher F., author
South Western Cengage Learning, 2013
Buku Teks