APA Style
Valentine,M. (1991).
An Introductory Guide to the Earth Summit June 1 - 12, 1992, Rio de Janeiro, Brazil. .
California:
UNCED.
Chicago Style
Valentine,M.
An Introductory Guide to the Earth Summit June 1 - 12, 1992, Rio de Janeiro, Brazil..
California:
UNCED,
1991.
.
MLA Style
Valentine,M.
An Introductory Guide to the Earth Summit June 1 - 12, 1992, Rio de Janeiro, Brazil..
California:
UNCED,
1991.
.
Turabian Style
Valentine,M.
An Introductory Guide to the Earth Summit June 1 - 12, 1992, Rio de Janeiro, Brazil..
California:
UNCED,
1991.
.