Chalfant, H. 1992. “No One Is in Control.” Pp. 4-11 in Vandalism: Research, Prevention and Social Policy, edited by H. H. Christensen , D. R. Johnson , and M. H. Brookes . Portland, OR: Department of Agriculture Forest Service.Christensen, H.H.; Johnson, D.R.; Brookes, M.H. (1992). Vandalism: research, prevention, and social policy (Report). United States Forest Service. doi:10.2737/PNW-GTR-293. hdl:2027/umn.31951d029749434. S2CID158966695.
Chalfant, H. 1992. “No One Is in Control.” Pp. 4-11 in Vandalism: Research, Prevention and Social Policy, edited by H. H. Christensen , D. R. Johnson , and M. H. Brookes . Portland, OR: Department of Agriculture Forest Service.Christensen, H.H.; Johnson, D.R.; Brookes, M.H. (1992). Vandalism: research, prevention, and social policy (Report). United States Forest Service. doi:10.2737/PNW-GTR-293. hdl:2027/umn.31951d029749434. S2CID158966695.
Chalfant, H. 1992. “No One Is in Control.” Pp. 4-11 in Vandalism: Research, Prevention and Social Policy, edited by H. H. Christensen , D. R. Johnson , and M. H. Brookes . Portland, OR: Department of Agriculture Forest Service.Christensen, H.H.; Johnson, D.R.; Brookes, M.H. (1992). Vandalism: research, prevention, and social policy (Report). United States Forest Service. doi:10.2737/PNW-GTR-293. hdl:2027/umn.31951d029749434. S2CID158966695.
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Gottlieb, Lisa. (2008). Graffiti art styles : a classification system and theoretical analysis. Jefferson, N.C.: McFarland. pp. 38–39. ISBN978-0-7864-3436-7. OCLC228608106.