North, Percy, "Bernhard Gutmann: an American impressionist, 1869-1936," New York: Abbeville Press, 1995.
Summary:
Portrait group with a man at right wearing a blue shirt and holding a hat up to his neck. He tilts his head to the right. A boy's head is behind his right shoulder. Behind the boy another man who holds a hat to his neck and tilts his head to the right. The third man is at left, wearing a red shirt and facing forward.