The New Encyclopaedia Britannica in 32 Volumes. Propaedia : outline of knowledge and guide to the Britannica / editor in chief Philip W. Goetz. -- 15-th ed. -- Chicago : Encyclopaedia Britannica Inc., 1991. -- 743 s. : 14 fareb. obr. -- ISBN 0-85229-529-4. všeobecné vedomosti * encyklopédie