OM KIDZ. (2018). SCIENCE ENCYCLOPEDIA FORCE, ELECTRICITY, METALS AND NON METALS (2nd.). OM KIDZ.
Chicago-čujuhus (17. p.)OM KIDZ. SCIENCE ENCYCLOPEDIA FORCE, ELECTRICITY, METALS AND NON METALS. 2nd. NEW DELHI: OM KIDZ, 2018.
MLA-čujuhus (9. p.)OM KIDZ. SCIENCE ENCYCLOPEDIA FORCE, ELECTRICITY, METALS AND NON METALS. 2nd. OM KIDZ, 2018.
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