Cita APA (7a ed.)

Holmes, C. (1931). National Gallery Trafalgar Square Ilustrated guide (sixth and revised edition.). National Gallery Trafalgar Square.

Cita Chicago Style (17a ed.)

Holmes, Charles. National Gallery Trafalgar Square Ilustrated Guide. sixth and revised edition. London: National Gallery Trafalgar Square, 1931.

Cita MLA (9a ed.)

Holmes, Charles. National Gallery Trafalgar Square Ilustrated Guide. sixth and revised edition. National Gallery Trafalgar Square, 1931.