Stull, E. C. (2004). Global discovery activities for the elementary grades. Jossey-Bass.
Lua i Stíl Chicago (17ú heag.)Stull, Elizabeth Crosby. Global Discovery Activities for the Elementary Grades. San Francisco, Calif: Jossey-Bass, 2004.
Lua MLA (9ú heag.)Stull, Elizabeth Crosby. Global Discovery Activities for the Elementary Grades. Jossey-Bass, 2004.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.