(1954). National Gallery of Art, Washington D.C. U. S. Government Printing Office.
Chicago-Zitierstil (17. Ausg.)National Gallery of Art, Washington D.C. U. S. Government Printing Office, 1954.
MLA-Zitierstil (8. Ausg.)National Gallery of Art, Washington D.C. U. S. Government Printing Office, 1954.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.