Custer, J. F., Bachman, D. C., & Grettler, D. J. (1987). Phase I/II archaeological research plan: U.S. Route 13 relief route, Kent and New Castle counties, Delaware. Dover: Delaware Department of Transportation.

Custer, Jay F., David C. Bachman, and David J. Grettler. Phase I/II Archaeological Research Plan: U.S. Route 13 Relief Route, Kent and New Castle Counties, Delaware. Dover: Delaware Department of Transportation, 1987.

Custer, Jay F., David C. Bachman, and David J. Grettler. Phase I/II Archaeological Research Plan: U.S. Route 13 Relief Route, Kent and New Castle Counties, Delaware. Dover: Delaware Department of Transportation, 1987.