APA

,, . (1988). World book encyclopaedia . Vol.VII : F. Chicago: World Book, Inc.

Chicago

,, . 1988. World book encyclopaedia . Vol.VII : F. Chicago: World Book, Inc.

Harvard

,, . (1988). World book encyclopaedia . Vol.VII : F. Chicago: World Book, Inc.

MLA

,, . World book encyclopaedia . Vol.VII : F. Chicago: World Book, Inc. 1988.