Baumol, William J.
Harcourt, Brace Jovanovich College Publishers, 1991
Buku Teks
Bowman, Marie Jean
Prentice-Hall, 1946
Buku Teks
Hutchison, T. W. (Thomas W.)
George Allen and Unwin, 1964
Buku Teks
Baumol, William J.
Harcourt Brace Jovanovich, 1979
Buku Teks
Owen, Diane S.
Harcourt, Brace Jovanovich , 1991
Buku Teks