1. J. Kepler: Strena seu de nive sexangula (Tampach, Frankfurt 1611)
2. N. Steno: De solido intra solidum naturaliter contento dissertationis prodromus (Stella, Florence 1669), English translation by J.G. Winter (Hafner, New York 1968
3. H.J. Scheel: Historical introduction. In: Handbook of Crystal Growth, Vol. 1a, ed. by D.T.J. Hurle (Elsevier, Amsterdam 1993) pp. 1–41, Chap. 1
4. D. Elwell, H.J. Scheel: Crystal Growth from High Temperature Solution (Academic, London 1975)
5. Collected Works;JW Gibbs,1928