1. Grubenmann-Niggli, Die Gesteinsmetamorphose, I, 1924, p. 335.
2. Adams and Coker, Amer. Journ. Sci., 29, 1910, p. 465.
3. G. W. Tyrrell, Trans. Roy. Soc. Edin., 53, 1924, p. 464.
4. Grubenmann-Niggli, Die Gesteinsmetamorphose, I, 1924 pp. 234–5.
5. E. H. Cunningham-Craig, “Metamorphism in the Loch Lomond District” Q.J.G.S., 60, 1904, pp. 10–29.