Peter Siemund. (2013). Varieties of English (1.). Cambridge University Press.
Lua i Stíl Chicago (17ú heag.)Peter Siemund. Varieties of English. 1. Cambridge University Press, 2013.
Lua MLA (8ú heag.)Peter Siemund. Varieties of English. 1. Cambridge University Press, 2013.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.