APA (7th ed.) Citation

Adam, R. (1991). The world book encyclopedia. A - L ([9th ed.].). World Book.

Chicago Style (17th ed.) Citation

Adam, Roy. The World Book Encyclopedia. A - L. [9th ed.]. Chicago: World Book, 1991.

MLA (9th ed.) Citation

Adam, Roy. The World Book Encyclopedia. A - L. [9th ed.]. World Book, 1991.