Não informado. (1969). Journal of Economic Literature. American Economic Association.
Lua i Stíl Chicago (17ú heag.)Não informado. Journal of Economic Literature. Nashville, Tenn: American Economic Association, 1969.
Lua MLA (8ú heag.)Não informado. Journal of Economic Literature. American Economic Association, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.