Gilbert, Douglas R., “Folk Singer Bob Rosenthal,” Digital Collections, accessed December 17, 2025, https://digitalcollections.library.gvsu.edu/document/53757.
Black and white photograph of folk singer, Robert "Bob" Rosenthal, singing and playing an acoustic guitar on a rooftop in New York City, New York. In the photograph, Bob is seen performing while seated on a rooftop ledge, with his reflection shining below in a pool of rain water. Scanned from the negative.