1. The dynamics of the formation of cone-sheets, ring-dykes, and cauldron-subsidences;Anderson;Proc. R. Soc. Edinburgh,1936
2. Bailey E. B. Clough C. T. (1924) Tertiary and post-Tertiary geology of Mull, Loch Aline and Oban. Mem. geol. Surv. Scotland, p 445.
3. Ring-dykes and their origin;Billings;Trans. N.Y. Acad. Sci,1943
4. Mechanics of igneous intrusion in New Hampshire;Billings;Am. J. Sci,1945
5. The geology of the Jos Plateau. 2, Younger Granite Complexes;Buchanan;Bull. geol. Surv. Nigeria,1971