1. Testing intelligibility among Yuman languages;Biggs;IJAL,1957
2. Studi Etiopici, 2. La lingua e la storia del Sidamo;Cerulli,1938
3. Introduction;Ferguson,1960
4. Also, IJAL 26 (3), 1–18.
5. Formal and informal standards in the Hindi regional language area;Gumperz,1960