APA

,, . (1988). World book encyclopaedia. Vol.IX : H. Chicago: World Book, Inc.

Chicago

,, . 1988. World book encyclopaedia. Vol.IX : H. Chicago: World Book, Inc.

Harvard

,, . (1988). World book encyclopaedia. Vol.IX : H. Chicago: World Book, Inc.

MLA

,, . World book encyclopaedia. Vol.IX : H. Chicago: World Book, Inc. 1988.