1. Plant Inspection Station strategic plan 2007–2012;Animal and Plant Health Protection Service,2007
2. Bulb Preclearance Program Identification Manual;Animal and Plant Health Inspection Service,2011
3. Cut Flowers and Greenery Import Manual;Animal and Plant Health Inspection Service,2012a
4. Plants for Planting Manual;Animal and Plant Health Inspection Service,2012b
5. Local indicators of spatial association - LISA;Anselin;Geographical Analysis,1995