Helfand, W. H. (2000). The nightingale's song: Nurses and nursing in the Ars Medica Collection of the Philadelphia Museum of Art. Philadelphia Museum of Art.
Citazione stile Chigago Style (17a edizione)Helfand, William H. The Nightingale's Song: Nurses and Nursing in the Ars Medica Collection of the Philadelphia Museum of Art. Philadelphia, Pa.: Philadelphia Museum of Art, 2000.
Citatione MLA (8a ed.)Helfand, William H. The Nightingale's Song: Nurses and Nursing in the Ars Medica Collection of the Philadelphia Museum of Art. Philadelphia Museum of Art, 2000.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.