Não informado. (1971). Journal of Vocational Behavior. Academic Press.
Lua i Stíl Chicago (17ú heag.)Não informado. Journal of Vocational Behavior. Orlando, Fla: Academic Press, 1971.
Lua MLA (8ú heag.)Não informado. Journal of Vocational Behavior. Academic Press, 1971.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.