YENİ BRITANNICA ANSİKLOPEDİSİ – İNGİLİZCE VERSİYON
PROPAEDIA – BİLGİNİN ANAHTARI – BRİTANİKA REHBERİ
MİKROPAEDYA HAZIR REFERANS VE DİZİN
THE NEW ENCYCLOPAEDIA BRITANNICA İN 30 VOLUMES / Chicago: Encyclopaedia Britannica, 1974 PROPAEDIA – OUTLINE OF KNOWLEDGE – GUIDE TO THE BRITANNICA MICROPAEDIA READY REFERENCE AND INDEX