Shubin, John A., author
Barnes & Noble, 1975
Buku Teks
Shubin, John A., author
Barnes & Noble Books, 1957
Buku Teks
Buku Teks
Cohen, William, author
Amacom, American Management Association., 1986
Buku Teks
Torpey, William G.,
D.Van Nostrand, 1953
Buku Teks