http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
T 51.623 -- WALTERS, Nigel V.- -- Principles of perspective, Nigel V.Walters, -- John Bromham.(2nd rev.ed.) - London:The -- Architectural Pr.(1975).127 S.mit Abb.4° -- 1975:B 811. -- Ko.°