Philadelphia Museum of Art, Shoemaker, I. H., Helfand, W. H., & Ittmann, J. W. (2011). Health for sale: Posters from the William H. Helfand collection : interview with William H. Helfand. Philadelphia Museum of Art.
Čikaški stil citiranja (17. izdanje)Philadelphia Museum of Art, Innis H. Shoemaker, William H. Helfand, i John W. Ittmann. Health for Sale: Posters from the William H. Helfand Collection : Interview with William H. Helfand. Philadelphia, PA: Philadelphia Museum of Art, 2011.
MLA način citiranja (8. izdanje)Philadelphia Museum of Art, et al. Health for Sale: Posters from the William H. Helfand Collection : Interview with William H. Helfand. Philadelphia Museum of Art, 2011.
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