APA Edition Citation

World Book. (1996). World Book Encyclopedia W- X- Y- Z (vol.21). World Book International.

Chicago Edition Citation

World Book. World Book Encyclopedia W- X- Y- Z (vol.21). London: World Book International, 1996.

MLA Edition Citation

World Book. World Book Encyclopedia W- X- Y- Z (vol.21). World Book International, 1996.

Warning: These citations may not always be 100% accurate.