• Encyclopædia Britannica (free limited access)
• Encyclopædia Britannica, English language reference work by Donald Stewart (2020)
• Wikisource: 1911 edition
• Encyclopædia Britannica (1911) Eleventh edition, in 28 volumes
• Encyclopædia Britannica (1875-1889) Ninth edition, in 24 volumes
• Tenth édition (1902-1903): 9 additional volumes + Atlas
• Encyclopædia Britannica (1852-1860) Eighth edition, in 21 volumes
• Encyclopædia Britannica (1815) Fifth edition, in 20 volumes
• Supplements (1824): 1 - 2 - 3 - 4 - 5 - 6
• Encyclopædia Britannica (1810) Fourth edition, in 20 volumes
• Encyclopædia Britannica (1788-1797) Third edition, in 18 volumes
• Encyclopædia Britannica (1778-1783) Second edition, in 10 volumes
• Encyclopædia Britannica (1771) First edition, in 3 volumes
• National Library of Scotland: all the editions
