Newman P[англ.].36. Hausa and the Chadic Languages // The World’s Major Languages / Edited by B. Comrie. — Second Edition. — London: Routledge, 2009. — P. 619 — Table 36.1 The Chadic Language Family (Inventory and Classification). — ISBN 0-203-30152-8.
Newman P[англ.]. Chadic classification and reconstructions // Afroasiatic linguistics. — 1977. — Vol. 5, № 1. — P. 1—42.