Bioretention Manual(PDF) (Report). Largo, MD: Prince George's County Department of Environmental Resources. 2009. pp. 6, 42. Archived from the original(PDF) on 2011-01-08.
Bioretention Manual(PDF) (Report). Largo, MD: Prince George's County Department of Environmental Resources. 2009. pp. 6, 42. Archived from the original(PDF) on 2011-01-08.