ebrary, Inc, Enger, S. K., & Yager, R. E. (2006). Exemplary science in grades PreK-4: Standards-based success stories. NSTApress.
Lua i Stíl Chicago (17ú heag.)ebrary, Inc, Sandra K. Enger, agus Robert Eugene Yager. Exemplary Science in Grades PreK-4: Standards-based Success Stories. Arlington, Va.: NSTApress, 2006.
Lua MLA (9ú heag.)ebrary, Inc, et al. Exemplary Science in Grades PreK-4: Standards-based Success Stories. NSTApress, 2006.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.