Clyde Robert Bulla. (1982). Daniel's Duck (I Can Read Level 3). HarperCollins.
Lua i Stíl Chicago (17ú heag.)Clyde Robert Bulla. Daniel's Duck (I Can Read Level 3). HarperCollins, 1982.
Lua MLA (9ú heag.)Clyde Robert Bulla. Daniel's Duck (I Can Read Level 3). HarperCollins, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.