(1969). A Brief Guide to the National Gallery of Art: Washington D.C. U. S. Government Printing Office.
Lua i Stíl Chicago (17ú heag.)A Brief Guide to the National Gallery of Art: Washington D.C. U. S. Government Printing Office, 1969.
Lua MLA (8ú heag.)A Brief Guide to the National Gallery of Art: Washington D.C. U. S. Government Printing Office, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.