Cita APA (7a ed.)

Crosby, T., & Happold, E. (1970). The necessary monument. Studio vista.

Cita Chicago Style (17a ed.)

Crosby, Theo, y Edmund Happold. The Necessary Monument. London: Studio vista, 1970.

Cita MLA (9a ed.)

Crosby, Theo, y Edmund Happold. The Necessary Monument. Studio vista, 1970.