Sowers, J. I. (1925). The boy and his vocation. The Manual arts press.
Lua i Stíl Chicago (17ú heag.)Sowers, John Irving. The Boy and His Vocation. Peoria, Ill.: The Manual arts press, 1925.
Lua MLA (8ú heag.)Sowers, John Irving. The Boy and His Vocation. The Manual arts press, 1925.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.