National gallery & Levey, M. (1989). La collection de la National Gallery. National Gallery Publications.
Citazione stile Chigago Style (17a edizione)National gallery e Michael Levey. La Collection De La National Gallery. Londres: National Gallery Publications, 1989.
Citatione MLA (8a ed.)National gallery e Michael Levey. La Collection De La National Gallery. National Gallery Publications, 1989.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.