Twist, C. (1997). Macmillan Revised ENCYCLOPEDIA of SCIENCE Life And Earth 4. Macmillan Reference.
Lua i Stíl Chicago (17ú heag.)Twist, Clint. Macmillan Revised ENCYCLOPEDIA of SCIENCE Life And Earth 4. Macmillan Reference, 1997.
Lua MLA (8ú heag.)Twist, Clint. Macmillan Revised ENCYCLOPEDIA of SCIENCE Life And Earth 4. Macmillan Reference, 1997.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.