APA (7th ed.) Citation

(1993). The World Book encyclopedia: I ([1st ed.].). [vl. n.].

Chicago Style (17th ed.) Citation

The World Book Encyclopedia: I. [1st ed.]. Chicago: [vl. n.], 1993.

MLA (9th ed.) Citation

The World Book Encyclopedia: I. [1st ed.]. [vl. n.], 1993.