Bryson, N. S., & Quarles, S. P. (2003). Have you got a license for that tree?: (and can you afford to use it?). Environmental Law Institute.
Lua i Stíl Chicago (17ú heag.)Bryson, Nancy Southard, agus Steven P. Quarles. Have You Got a License for That Tree?: (and Can You Afford to Use It?). Washington, D.C.: Environmental Law Institute, 2003.
Lua MLA (9ú heag.)Bryson, Nancy Southard, agus Steven P. Quarles. Have You Got a License for That Tree?: (and Can You Afford to Use It?). Environmental Law Institute, 2003.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.