Sally Hewitt. (2000). Life Cycles (Discovering Nature). Copper Beech.
Lua i Stíl Chicago (17ú heag.)Sally Hewitt. Life Cycles (Discovering Nature). Copper Beech, 2000.
Lua MLA (9ú heag.)Sally Hewitt. Life Cycles (Discovering Nature). Copper Beech, 2000.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.