George, K. D. (1974). Elementary school science, why and how. D. C. Heath.
Citación estilo ChicagoGeorge, Kenneth D. Elementary School Science, Why and How. Lexington, Mass.: D. C. Heath, 1974.
Cita MLAGeorge, Kenneth D. Elementary School Science, Why and How. D. C. Heath, 1974.
Warning: These citations may not always be 100% accurate.