Columbia subject headings:
English language--Lexicography.
English language--Standardization.
English language--Variation.
Oxford English dictionary.
Harvard subject headings:
Encyclopedias and dictionaries--History and criticism
English language--Lexicography
English language--Standardization
English language--Variation
Oxford English dictionary.
Princeton subject headings:
English language--Lexicography.
English language--Standardization.
English language--Variation.
Oxford English dictionary.