South Semitic languages

p. 335 Leonid Kogan and Andrey Korotayev: Sayhadic Languages (Epigraphic South Arabian) // Semitic Languages. London: Routledge, 1997, p[. 157-183.

*u o [o:] < Proto-Semitic *aw [ɨ]是閉央不圓唇元音，勿與閉前不圓唇元音[i]混淆。 Evans De Lacy O'Leary, 2000 "Comparative grammar of the semitic languages". Routledge. P 23

Simeone-Senelle, Marie-Claude, The Modern South Arabian Languages, Hetzron, Robert (编), The Semitic Languages, London: Routledge: 381–382, 1997  在PHOIBLE上搜尋含有[θʼ]的語言

Simeone-Senelle, Marie-Claude. The Modern South Arabian Languages (PDF). Hetzron, R. (编). The Semitic Languages. London: Routledge. 1997: 378–423 [2017-05-12]

Ethnologue: Languages of the World. 15th edition. Dallas: Summer Institute of Linguistics. Loren F. Bliese. 1976. "Afar", The Non-Semitic Languages of Ethiopia