Walters, N. V., & Bromham, J. (1975). Principles of perspective (2d rev. ed.). Architectural Press.
Lua i Stíl Chicago (17ú heag.)Walters, Nigel V., agus John Bromham. Principles of Perspective. 2d rev. ed. London: Architectural Press, 1975.
Lua MLA (9ú heag.)Walters, Nigel V., agus John Bromham. Principles of Perspective. 2d rev. ed. Architectural Press, 1975.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.