Senghas, Ann, and Marie Coppola, 'Getting to the Point: How a Simple Gesture Became a Linguistic Element in Nicaraguan Signing', in Gaurav Mathur, and Donna Jo Napoli (eds), Deaf around the World: The Impact of Language (2010; online edn, Oxford Academic, 1 Jan. 2011), https://doi.org/10.1093/acprof:oso/9780199732548.003.0007

Pfau, Roland, 'A Point Well Taken: On the Typology and Diachrony of Pointing', in Gaurav Mathur, and Donna Jo Napoli (eds), Deaf around the World: The Impact of Language (2010; online edn, Oxford Academic, 1 Jan. 2011), https://doi.org/10.1093/acprof:oso/9780199732548.003.0008