Newhall, N. W. (1975). P.H. Emerson: The fight for photography as a fine art. Aperture.
Lua i Stíl Chicago (17ú heag.)Newhall, Nancy Wynne. P.H. Emerson: The Fight for Photography as a Fine Art. New York: Aperture, 1975.
Lua MLA (9ú heag.)Newhall, Nancy Wynne. P.H. Emerson: The Fight for Photography as a Fine Art. Aperture, 1975.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.