Ragan, W. B., & Shepherd, G. D. (1977). Modern elementary curriculum (5th ed.). Holt, Rinehart and Winston.
Lua i Stíl Chicago (17ú heag.)Ragan, William B., agus Gene D. Shepherd. Modern Elementary Curriculum. 5th ed. New York: Holt, Rinehart and Winston, 1977.
Lua MLA (8ú heag.)Ragan, William B., agus Gene D. Shepherd. Modern Elementary Curriculum. 5th ed. Holt, Rinehart and Winston, 1977.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.