Seago, N, Jacobs, J., Driscoll, M., Nikula, J. , Matassa, M. Callahan, P. (2013) Developing Teachers' Knowledge of a Transformations-Based Approach to Geometric Similarity. Mathematics Teacher Educator Vol. 2, No. 1 (September 2013), pp. 74-85

Callahan, P., Heubach, S., & Chinn, P. (2006) Graphs of Tilings. Congr. Numer. 183 (2006), 129-138

Callahan, P. (2005) Scaling-up Capacity and Expertise: Policy Implications of California’s Teacher Professional Development Initiatives. Paper presented at the annual meeting of the American Educational Research Association. Montreal, Canada

Callahan, P. (2003) Assessing knowledge of mathematics for teaching mathematics. Paper presented at the annual meeting of the American Educational Research Association. Chicago, IL.

Callahan, P. & Stanley, R. (2001) In-depth secondary mathematics, institute materials. Texas Education Agency and Charles A. Dana Center

Callahan, P. & Confrey, J. (1999) Generative domain knowledge as a framework for pre-service teachers’ learning functions and modeling. Paper presented at the annual meeting of the American Educational Research Association. Montreal, Canada.

Callahan, P. (1999) Technology, tools, and multiple representations: pre-service teachers’ understanding of functions and modeling. Proceedings of the21st Annual Meeting of the North American Chapter of the International Group for the Psychology of Mathematics Education. Volume 2, 698-702. Columbus, OH: ERIC Clearinghouse for Science, Mathematics and Environmental Education.

Callahan. P., Hildebrand, M. & Weeks. (1999). A census of cusped hyperbolic 3-manifolds. Mathematics of Computation. Vol. 68, No 225, 321-332 + Supplement on microfiche.

Callahan, P. & Reid, A. (1998). Hyperbolic structures on knot complements. In C. Adams (Ed.), Chaos, Solitons, and Fractals, Special Issue. Vol. 9, No. 4/5, 705-738.

Callahan, P. (1997) Symmetric surgery on asymmetric knots. Mathematische Annalen. 308, 1-4.

Callahan. P, Dean, J. & Weeks, J. (1999). The simplest hyperbolic knots. Knot Theory and its Ramifications., Vol. 8, No. 3, 279-297.