Levine, R., & Green, G. M. (1999). Studies in contemporary phrase structure grammar. Cambridge University Press.
Lua i Stíl Chicago (17ú heag.)Levine, Robert, agus Georgia M. Green. Studies in Contemporary Phrase Structure Grammar. Cambridge, Eng: Cambridge University Press, 1999.
Lua MLA (9ú heag.)Levine, Robert, agus Georgia M. Green. Studies in Contemporary Phrase Structure Grammar. Cambridge University Press, 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.