Gaya APA
Gill, R, T.
(1973).
Economic development : Past and Present
(
Edisi 3)
.
New Jersey:
Prentice Hall.
Gaya MLA
Gill, Richard, T.
"Economic development : Past and Present".
Edisi 3
New Jersey:
Prentice Hall,
1973.
Buku Tercetak.