APA
Lester R. Brown, . (1991). State of the World. : W. W. Norton & Company.
Chicago
Lester R. Brown, . 1991. State of the World. : W. W. Norton & Company.
Harvard
Lester R. Brown, . (1991). State of the World. : W. W. Norton & Company.
MLA
Lester R. Brown, . State of the World. : W. W. Norton & Company. 1991.
