APA Style
Statistical yearbook 1990. (1990).
:
Paris : UNESCO.
Chicago Style
Statistical yearbook 1990.
.
:
Paris : UNESCO,
1990.
.
MLA Style
Statistical yearbook 1990.
.
:
Paris : UNESCO,
1990.
.
Turabian Style
Statistical yearbook 1990.
:
Paris : UNESCO,
1990.
.