Various. Encyclopaedia Britannica, 11th Edition, "Groups, Theory of" to "Gwyniad" Volume 12, Slice 6.
Chicago Style (17th ed.) CitationVarious. Encyclopaedia Britannica, 11th Edition, "Groups, Theory of" to "Gwyniad" Volume 12, Slice 6.
MLA (9th ed.) CitationVarious. Encyclopaedia Britannica, 11th Edition, "Groups, Theory of" to "Gwyniad" Volume 12, Slice 6.
Warning: These citations may not always be 100% accurate.