- Bethune, S. T., D. J. Frederick, M. F. Jurgensen, and N. F. Sloan. 1976. A review of current research on controls for Dutch elm disease. Michigan Technical University, L'Anse, Michigan, Research Note 19.
- Frederick, D. J., N. F. Sloan, and W. S. Skowron. 1976. Potential insect transmission of Scleroderris lagerbergii by scolytid beetles . Plant Disease Reporter 60:411-413.