Cita APA (7th ed.)

Ruskin, J. (1912). A popular handbook to the national gallery. Macmillan.

Cita Chicago (17th ed.)

Ruskin, John. A Popular Handbook to the National Gallery. Londres: Macmillan, 1912.

Cita MLA (9th ed.)

Ruskin, John. A Popular Handbook to the National Gallery. Macmillan, 1912.