Gaya APA
Human Development Report 1991. (1991).
:
United Nations Development Programme.
Gaya Chicago
Human Development Report 1991.
.
:
United Nations Development Programme,
1991.
Buku.
Gaya MLA
Human Development Report 1991.
.
:
United Nations Development Programme,
1991.
Buku.
Gaya Turabian
Human Development Report 1991.
:
United Nations Development Programme,
1991.
Buku.