found: Work cat.: 00034244: Ngunga, A. Phonology and morphology of the Ciyao verb, 2000.
found: Fivaz, D. African langs., 1979:p. 64, under Bantu langs. (Yao Group: ciYao, var. Ayo, Djao, Adjao, Adwawa, Adsoa, Ayawa, Achawa, Ajawa, Hiao, Haiao, Hyao, Jao, Veiao, Wajao)
found: Biebuyck, D.P. African ethnonyms, 1996:p. 277 (Yao (Malawi, Mozambique, Tanzania) var. Wayao)
found: Ethnologue, 13th ed. Internet ed. 1996:under Malawi (Yao (Chiyao, Achawa, Adsawa, Adsoa, Ajawa, Ayawa, Ayo, Ayao, Djao, Haiao, Hiao, Hyao, Jao, Veiao, Wajao)) under Mozambique (Yao (Chiyao, Ciyao, Achawa, Adsawa, Adsoa, Ajawa, Ayawa, Ayo, Djao, Haiao, Hiao, Hyao, Jao, Veiao, Wajao)) under Tanzania (Yao (Chiyao, Achawa, Adsawa, Ajawa, Ayawa, Ayo, Djao, Haiao, Hiao, Hyao, Jao, Veiao, Wajao)) language index (Yao (and some variants) also alternates for Kuuku-Ya'u, an Australian lang., and Iu Mien, a Southeast Asian lang.)
found: English-Ciyawo learner's dictionary = Dikishonale ja ŵakulijiganya Cingelesi-Ciyawo, 2018:p. xii (Ciyawo is the first language of more than 2.5 million people in Malawi, Mozambique and Tanzania; spoken by the Yawo)
found: Ethnologue, via WWW, Aug. 2, 2018(Yao; a language of Malawi; ISO 639-3: yao; Alternate Names: Achawa, Adsawa, Adsoa, Ajawa, Ayao, Ayawa, Ayo, Chiyao, Ciyaawo, Chiyawo Ciyao, Djao, Haiao, Hiao, Hyao, Jao, Veiao, Wajao, Yawo; Classification: Niger-Congo, Atlantic-Congo, Volta-Congo, Benue-Congo, Bantoid, Southern, Narrow Bantu, Central, P, Yao (P.21); also spoken in: Mozambique (alternate names: Achawa, Adsawa, Adsoa, Ajawa, Ayawa, Ayo, Chiyao, Ciyao, Djao, Haiao, Hiao, Hyao, Jao, Veiao, Wajao, Yawo); Tanzania (alternate names: Achawa, Adsawa, Ajawa, Ayawa, Ayo, Chiyao, Djao, Hajao, Hiao, Hyao, Jao, Kihiau, Kihyao, Kiyao, Veiao, Wajao); Zambia (alternate names: Achawa, Adsawa, Adsoa, Ajawa, Ayawa, Ayo, Chichawa, Chiyao, Ciyao, Djao, Haiao, Hiao, Hyao, Jao, Veiao, Wajao); 2,200,000 speakers in Malawi; 496,000 in Mozambique; 420,000 in Tanzania; 200 families or more in the 1970s in Zambia)
