Leftwich, Richard H.
United States of America, 1984
Buku Teks SO
Baumol, William J.
Harcourt, Brace Jovanovich College Publishers, 1985
Buku Teks
Baumol, William J.
Harcourt, Brace Jovanovich College Publishers, 1991
Buku Teks
Baumol, William J.
Harcourt Brace Jovanovich, 1979
Buku Teks
Owen, Diane S.
Harcourt, Brace Jovanovich , 1991
Buku Teks