Related Clues:

• U.K. reference book
• It comes in many vols.
• Brit. reference bk.
• Definitive def. source
• Wordsmith's ref.
• Noted Brit lexicon
• Venerable lexicon: Abbr.
• Massive ref. work
• Major ref. work
• Ref. set
• UK reference book
• Venerable British ref. set
• Authoritative ref.
• Brit. ref. work
• Citation-filled ref.