1. Shepherd W. Flint: its origin, properties and uses. Transatlantic Arts; 1st edition: 1972: pp 256.
2. Hahn-Pedersen M. AP Møller and the Danish Oil: Denmark, J.H. Schultz Grafisk; 1999; pp 357.
3. Banner S. Development of Munroe regional medical center. Star Banner 6A, Ocala, Florida; 2001.
4. Machine Tunnelling in Chalk with Flint with Particular Reference to the Mechanical Properties of Flint [Unpublished Ph.D. Thesis];Cumming,1999
5. Mortimore RN. Chalk: a stratigraphy for all reasons. The Scott Simpson Lecture: Proceedings of the Ussher Society, Geosciences in South West England. 2001; 10(2):105-122.