Holmes, C. (1931). National gallery Trafalgar square illustrated guide (6a. ed.). Trustees.
Chicago Style (17th ed.) CitationHolmes, Charles. National Gallery Trafalgar Square Illustrated Guide. 6a. ed. Londres: Trustees, 1931.
MLA (9th ed.) CitationHolmes, Charles. National Gallery Trafalgar Square Illustrated Guide. 6a. ed. Trustees, 1931.
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