1. References 1:Beever, J. (2012). Pavement Chalk Artist: The Three-dimensional Drawings of Julian Beever. North American: Firefly Books.
2. References 2: Conklin, T. R. (2012). Street Art, Ideology, and Public Space. Portland : Portland State University.
3. References 3: Edelson, B. (2008). Street Art NOIR. Street Art Noir.
4. References 4: Gleaton, K. M. (2012). Power to the People: Street Art as an Agency for Change. Minnesota: The University of Minnesota.
5. References 5: Greenpeace. (2020, 9 7). Kurt Wenner Pavement Art Gallery 1. Retrieved from http://kurtwenner.com/galleries/pavement/pavement_1/pages/StreetPaintingGallery1.003.htm