Zawadzki, R. F. (1962). Hayes practical science lessons and experiments: Elementary book 4. Hayes School Publishing.
Chicago-viite (17. p.)Zawadzki, Robert F. Hayes Practical Science Lessons and Experiments: Elementary Book 4. Wilkingburg, PA: Hayes School Publishing, 1962.
MLA-viite (9. p.)Zawadzki, Robert F. Hayes Practical Science Lessons and Experiments: Elementary Book 4. Hayes School Publishing, 1962.
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