Willis, Karl D.D.; Lin, Juncong; Mitani, Jun; Igarashi, Takeo (2010). "Spatial sketch". Proceedings of the fourth international conference on Tangible, embedded, and embodied interaction. TEI '10. New York, NY, USA: ACM. pp. 5–12. doi:10.1145/1709886.1709890. ISBN9781605588414. S2CID16624461.
Willis, Karl D.D.; Lin, Juncong; Mitani, Jun; Igarashi, Takeo (2010). "Spatial sketch". Proceedings of the fourth international conference on Tangible, embedded, and embodied interaction. TEI '10. New York, NY, USA: ACM. pp. 5–12. doi:10.1145/1709886.1709890. ISBN9781605588414. S2CID16624461.
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Golden, Krishna (2015). The best interface is no interface : the simple path to brilliant technology. [Berkeley, California]: New Riders. p. 92. ISBN9780133890334. OCLC884306639.