Zeshan Ulrike, Cesar Ernesto Escobedo Delgado, Hasan Dikyuva, Sibaji Panda and Connie de Vos. Cardinal numerals in rural sign languages: Approaching cross-modal typology // Linguistic Typology. — 2013. — Вып. 17, № 3. — С. 357-396. — doi:10.1515/lity-2013-0019.
Connie de Vos, Roland Pfau. Sign Language Typology: The Contribution of Rural Sign Languages // Annual Review of Linguistics. — 2015. — Вып. 1. — С. 265-288. — doi:10.1146/annurev-linguist-030514-124958.
