Não informado. (1977). National Gallery Technical Bulletin. National Gallery.
Chicagoスタイル(17版)引用形式Não informado. National Gallery Technical Bulletin. London: National Gallery, 1977.
MLA(8版)引用形式Não informado. National Gallery Technical Bulletin. National Gallery, 1977.
警告: この引用は必ずしも正確ではありません.