Carin, A. A., & Sund, R. B. (1989). Guided discovery activities for elementary school science (2nd ed.). Merrill.
Lua i Stíl Chicago (17ú heag.)Carin, Arthur A., agus Robert B. Sund. Guided Discovery Activities for Elementary School Science. 2nd ed. Columbus, Ohio: Merrill, 1989.
Lua MLA (9ú heag.)Carin, Arthur A., agus Robert B. Sund. Guided Discovery Activities for Elementary School Science. 2nd ed. Merrill, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.