Clay, S. A. (2011). Invasive species. CRC Press.
Lua i Stíl Chicago (17ú heag.)Clay, Sharon A. Invasive Species. Boca Raton, FL: CRC Press, 2011.
Lua MLA (9ú heag.)Clay, Sharon A. Invasive Species. CRC Press, 2011.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.