Showell, B. (2010). A-Z of flowers portraits: An illustrated guide to painting 40 beautiful flowers in watercolour. Search.
Lua i Stíl Chicago (17ú heag.)Showell, Billy. A-Z of Flowers Portraits: An Illustrated Guide to Painting 40 Beautiful Flowers in Watercolour. Tunbridge Wells: Search, 2010.
Lua MLA (9ú heag.)Showell, Billy. A-Z of Flowers Portraits: An Illustrated Guide to Painting 40 Beautiful Flowers in Watercolour. Search, 2010.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.