Education Development Center (Newton, Mass.), & Elementary Science Study (Newton, Mass.). (1974). Teacher's guide for Growing seeds: Observing and recording growth of seeds. Webster Division, McGraw Hill.
Lua i Stíl Chicago (17ú heag.)Education Development Center (Newton, Mass.), agus Mass.) Elementary Science Study (Newton. Teacher's Guide for Growing Seeds: Observing and Recording Growth of Seeds. New York: Webster Division, McGraw Hill, 1974.
Lua MLA (8ú heag.)Education Development Center (Newton, Mass.), agus Mass.) Elementary Science Study (Newton. Teacher's Guide for Growing Seeds: Observing and Recording Growth of Seeds. Webster Division, McGraw Hill, 1974.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.