Sources

• http://www.theykid.com/bubble-gum

• http://micolhebron.artcodeinc.com/pages/bubble-gum-pop-2009/

• http://www.bestogdendentist.com/2012/09/is-chewing-gum-a-good-or-bad-idea/

• http://saxonfoto.deviantart.com/art/Gum-Wall-356918540

• http://www.dreamstime.com/royalty-free-stock-photo-seattle-gum-wall-image22027735

• http://www.amazingplacesonearth.com/seattle-gum-wall-usa/