APA
Brown R. {. a., . (1989). State of the World 1988. Prentice - Hall, New delhi: .
Chicago
Brown R {et al}, . 1989. State of the World 1988. Prentice - Hall, New delhi: .
Harvard
Brown R. {. a., . (1989). State of the World 1988. Prentice - Hall, New delhi: .
MLA
Brown R {et al}, . State of the World 1988. Prentice - Hall, New delhi: . 1989.