Northeast Conference on the Teaching of Foreign Languages & Bird, T. E. (1968). Foreign language learning: Research and development : an assessment. MLA Materials Center.
Lua i Stíl Chicago (17ú heag.)Northeast Conference on the Teaching of Foreign Languages agus Thomas E. Bird. Foreign Language Learning: Research and Development : An Assessment. New York: MLA Materials Center, 1968.
Lua MLA (8ú heag.)Northeast Conference on the Teaching of Foreign Languages agus Thomas E. Bird. Foreign Language Learning: Research and Development : An Assessment. MLA Materials Center, 1968.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.