Coble, Charles,
Earth Science
, “the Nature of Matter”, Prentice Hall/Allyn and Bacon, New Jersey, 1987, pp. 126-147
Holden, Alan and Morrison, Phyllis,
Crystals and Crystal Growing
, The MIT Press, Cambridge, Massachusetts, 1988, pp. 93-108
Holden, Alan,
The Nature of Solids
, Columbia University Press, New York and London, 1965, pp. 98-117
Knight, Charles and Nancy,
Scientific American
, “Snow Crystals”, January, 1973, pp. 100-107
McGavack, John Jr. and LaSalle, Donald P.,
Crystals, Insects and Unknown Objects
,Talcott Mountain Science Center Press, Avon, Connecticut, pp 132-146
Grollier,
Book of Popular Science
, “Symmetry Unlimited.” Grolier International, Philippines, 1974, pp. 337-342
Wood, Elizabeth A.,
Crystals, A Handbook For School Teachers
, Elizabeth Wood, 1972, pp. 9-20, 40-41