Center for Research and Documentation on World Language Problems. (1977). Language Problems and Language Planning. University of Texas Press.
Lua i Stíl Chicago (17ú heag.)Center for Research and Documentation on World Language Problems. Language Problems and Language Planning. Austin, Tex: University of Texas Press, 1977.
Lua MLA (8ú heag.)Center for Research and Documentation on World Language Problems. Language Problems and Language Planning. University of Texas Press, 1977.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.