Paper  bibtex   

@book{darrisPlantGuideSitka2011,
  title = {Plant Guide for {{Sitka}} Alder},
  author = {Darris, D. C.},
  date = {2011},
  location = {{Corvallis}},
  url = {http://plants.usda.gov/plantguide/pdf/pg_alvis.pdf},
  keywords = {*imported-from-citeulike-INRMM,~INRMM-MiD:c-13496483,alnus-viridis,forest-pests,species-distribution}
}