Citazione Stile APA (7a Edizione)

Holmes, C. (1931). National gallery Trafalgar square illustrated guide (6a. ed.). Trustees.

Citazione stile Chigago Style (17a edizione)

Holmes, Charles. National Gallery Trafalgar Square Illustrated Guide. 6a. ed. Londres: Trustees, 1931.

Citatione MLA (9a ed.)

Holmes, Charles. National Gallery Trafalgar Square Illustrated Guide. 6a. ed. Trustees, 1931.