Ivany, J. W. G. (1975). Today's science: A professional approach to teaching elementary school science. Science Research Associates.
Chicago-referens (17:e uppl.)Ivany, J. W. George. Today's Science: A Professional Approach to Teaching Elementary School Science. Chicago: Science Research Associates, 1975.
MLA-referens (8:e uppl.)Ivany, J. W. George. Today's Science: A Professional Approach to Teaching Elementary School Science. Science Research Associates, 1975.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.