Fitterling, J. M., Martin, J. E., Gramling, S., Cole, P., & Milan, M. A. (1988). Behavioral management of exercise training in vascular headache patients: An investigation of exercise adherence and headache activity. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1286089

Fitterling, J M., J E. Martin, S. Gramling, P. Cole, and M A. Milan. Behavioral Management of Exercise Training in Vascular Headache Patients: An Investigation of Exercise Adherence and Headache Activity. 1988.

Fitterling, J M., et al. Behavioral Management of Exercise Training in Vascular Headache Patients: An Investigation of Exercise Adherence and Headache Activity. 1988.