Cita APA (7th ed.)

Langmuir, E. (1998). National Gallery: Guía. National Gallery Company Limited.

Cita Chicago (17th ed.)

Langmuir, Erika. National Gallery: Guía. Londres: National Gallery Company Limited, 1998.

Cita MLA (9th ed.)

Langmuir, Erika. National Gallery: Guía. National Gallery Company Limited, 1998.