Gaya APA
World Bank annual report 1977. (1977).
:
The World Bank.
Gaya Chicago
World Bank annual report 1977.
.
:
The World Bank,
1977.
Buku.
Gaya MLA
World Bank annual report 1977.
.
:
The World Bank,
1977.
Buku.
Gaya Turabian
World Bank annual report 1977.
:
The World Bank,
1977.
Buku.