Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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