On the back of the photograph is the caption, “The position in which Gef showed his fingers, with Mrs. Irving understudying for Gef in Voirrey’s room and Mr. Irving pointing at them in his bedroom.”
Nandor Fodor, “Photograph of Mr. and Mrs. Irving demonstrating Gef’s actions in Voirrey’s room,” Folder “Gef the Talking Mongoose,” Box A, Eileen J. Garrett Parapsychology Foundation Collection, Collection 331, Special Collections, University of Maryland, Baltimore County (Baltimore, MD).