QUALLEN, S. B. (2006). CHAMPIONSHIP SCIENCE FAIR PROJECTS. GOODWILL PUBLISHING HOUSE.
Chicago-viite (17. p.)QUALLEN, SUDIPTA. BARDHAN. CHAMPIONSHIP SCIENCE FAIR PROJECTS. NEW DELHI: GOODWILL PUBLISHING HOUSE, 2006.
MLA-viite (9. p.)QUALLEN, SUDIPTA. BARDHAN. CHAMPIONSHIP SCIENCE FAIR PROJECTS. GOODWILL PUBLISHING HOUSE, 2006.
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