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Concerning "Lake Balls," "Cladophora Balls" and "Coal Balls"E. M. KindleBioone1934DOI 10.2307/2419894
Crystal Balls and Magic Eight BallsDewan, MayaLippincott Williams and Wilkins2019DOI 10.1097/pcc.0000000000002147
Plastic Balls, Plastic Hemispheres, Styrofoam BallsH. P. StablerAmerican Association of Physics Teachers (AAPT)1961DOI 10.1119/1.1937853
