Gwinn, Robert P. The New encyclopaedia Britannica / Robert P. Gwinn, Peter B. Norton and Robert McHenry. - 15th ed. - Chicago : Encyclopaedia Britannica, 1993. - 971 p. : ill. ; 29 cm. - V-17 . Spine title: Britannica. Includes bibliographical references. ISBN: 0852295715 Subjects--Topical Terms: Encyclopedias and dictionaries. Dewey Class. No.: 030 / GWN