Stone, Christopher D.
Harper & Row , 1975
Buku Teks
Miles, Robert H.
Goodyear Publishing Company, 1980
Buku Teks
Edwards, Ronald S.
Macmillan, 1961
Buku Teks
Baumol, William J.
Macmillan, 1959
Buku Klasik
McGuire, Joseph W.
Prentice-Hall, 1964
Buku Teks