Gaya APA
NELLIS, J, G., PARKER, D.
(1997).
The essence of business economics
(
2nd ed.)
.
London:
Prentice Hall.
Gaya MLA
NELLIS, Joseph, G.., PARKER, David.
"The essence of business economics".
2nd ed.
London:
Prentice Hall,
1997.
Buku.