Angela Royston. (2002). Color (My World of Science). Heinemann/Raintree.
Lua i Stíl Chicago (17ú heag.)Angela Royston. Color (My World of Science). Heinemann/Raintree, 2002.
Lua MLA (9ú heag.)Angela Royston. Color (My World of Science). Heinemann/Raintree, 2002.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.