WASHTON, N. S. (1974). Teaching science in elementary and middle schools. David McKay Company.
Lua i Stíl Chicago (17ú heag.)WASHTON, Nathan S. Teaching Science in Elementary and Middle Schools. New York: David McKay Company, 1974.
Lua MLA (9ú heag.)WASHTON, Nathan S. Teaching Science in Elementary and Middle Schools. David McKay Company, 1974.
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