APA Style
World resources 1988-1989. (1988).
New York:
Basic.
Chicago Style
World resources 1988-1989.
.
New York:
Basic,
1988.
.
MLA Style
World resources 1988-1989.
.
New York:
Basic,
1988.
.
Turabian Style
World resources 1988-1989.
New York:
Basic,
1988.
.