Roberts, S., & Conway, A. (1961). The Welsh in America: Letters from the immigrants. University of Minnesota Press.
Lua i Stíl Chicago (17ú heag.)Roberts, Sarah, agus Alan Conway. The Welsh in America: Letters from the Immigrants. Minneapolis: University of Minnesota Press, 1961.
Lua MLA (9ú heag.)Roberts, Sarah, agus Alan Conway. The Welsh in America: Letters from the Immigrants. University of Minnesota Press, 1961.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.