Völkel, S., & Ohler, P. Understanding pictures in early childhood: Sabine Völkel. Peter Ohler. Origins of pictures : anthropological discourses in image science.(2013).

Völkel, Sabine, and Peter Ohler. "Understanding Pictures in Early Childhood: Sabine Völkel. Peter Ohler." Origins of Pictures : Anthropological Discourses in Image Science.(2013) .

Völkel, Sabine, and Peter Ohler. "Understanding Pictures in Early Childhood: Sabine Völkel. Peter Ohler." Origins of Pictures : Anthropological Discourses in Image Science.(2013), .