Braden, J. B., Folmer, H., Ulen, T., Folmer, H., Ulen, T. S., & Folmer, H. (1996). Environmental policy with political and economic integration: The European Union and the United States. Cheltenham: E. Elgar Pub..

Braden, John B., H. Folmer, Thomas Ulen, Henk Folmer, Thomas S. Ulen, and Henk Folmer. Environmental Policy With Political and Economic Integration: The European Union and the United States. Cheltenham: E. Elgar Pub., 1996.

Braden, John B., et al. Environmental Policy With Political and Economic Integration: The European Union and the United States. Cheltenham: E. Elgar Pub., 1996.