APA (7th ed.) Citation

(1842). [Encyclopaedia Britannica] ([7th ed.].). [publisher not identified].

Chicago Style (17th ed.) Citation

[Encyclopaedia Britannica]. [7th ed.]. [Edinburgh]: [publisher not identified], 1842.

MLA (9th ed.) Citation

[Encyclopaedia Britannica]. [7th ed.]. [publisher not identified], 1842.