Langacker, R. W. Cognitive grammar. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Langacker, Ronald W. Cognitive Grammar. Oxford University Press.
Lua MLA (8ú heag.)Langacker, Ronald W. Cognitive Grammar. Oxford University Press.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.