Re-cycling, The Economist, 1. Dezember 2012. Abgerufen am 26. Januar 2013 „First, he folds the cardboard—commercial-grade material, made from recycled paper“
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worldwide.espacenet.com
Patentanmeldung EP2507122A1: Fahrrad aus recyclingfähigem Karton. Angemeldet am 6. Dezember 2010, veröffentlicht am 10. Oktober 2012, Erfinder: Tsafrir Bashan, Izhar Gafni.
Karen S. Garvin: Renewable & Nonrenewable Materials.Livestrong Foundation, 21. November 2011, abgerufen am 26. Januar 2013: „Renewable materials are sustainable materials, which means, according to the Rutgers University Center for Sustainable Materials, these materials do not use up non-renewable resources. These raw materials are abundant and biodegradable, and are used to make diverse products such as adhesives and cardboard.“