Gaya APA
GILL, R, T. (1963).
ECONOMIC DEVELOPMENT: PAST AND PRESENT .
Englewood cliffs,New Jersey:
Prentice-Hall.Inc.
Gaya MLA
GILL, Richard, T..
"ECONOMIC DEVELOPMENT: PAST AND PRESENT".
Englewood cliffs,New Jersey:
Prentice-Hall.Inc,
1963.
Textbook.