Cita APA (7th ed.)

Langmuir, E. (1994). The national gallery companion guide. National Gallery.

Cita Chicago (17th ed.)

Langmuir, Erika. The National Gallery Companion Guide. London: National Gallery, 1994.

Cita MLA (9th ed.)

Langmuir, Erika. The National Gallery Companion Guide. National Gallery, 1994.