References
http://www.biography.com/people/vincent-van-gogh-9515695?page=3
http://entertainment.howstuffworks.com/arts/artwork/vincent-van-gogh-final-paintings6.htm
http://eol.org/pages/747/overview
http://www.fcps.edu/islandcreekes/ecology/cabbage_white.htm
http://www.insectlifeforms.com/605020557609270/Silk_Moths__Saturnia_pyri__9270.aspx
http://www.loc.gov/rr/scitech/mysteries/butterflymoth.html
http://maisonneuve.org/post/2012/06/28/grass-and-butterflies-van-gogh-national-gallery/
http://www.nationalgallery.org.uk/paintings/vincent-van-gogh-long-grass-with-butterflies
http://www.plantwise.org/KnowledgeBank/Datasheet.aspx?dsid=51990
http://www.psmicrographs.co.uk/great-peacock-moth--saturnia-pyri-/science-image/peacock-moth
http://www.theguardian.com/artanddesign/2010/jan/15/van-gogh-his-own-words
http://www.vangoghgallery.com/misc/biography.html
http://www.vangoghmuseum.nl/vgm/index.jsp?page=2914&lang=en
http://en.wikipedia.org/wiki/Butterflies_(Van_Gogh_series)#Groupings_of_butterfly_and_garden_paintings
http://en.wikipedia.org/wiki/Pieris_rapae
http://en.wikipedia.org/wiki/Saturnia_pyri
http://en.wikipedia.org/wiki/Saturniidae
http://entertainment.howstuffworks.com/arts/artwork/vincent-van-gogh-final-paintings6.htm
http://eol.org/pages/747/overview
http://www.fcps.edu/islandcreekes/ecology/cabbage_white.htm
http://www.insectlifeforms.com/605020557609270/Silk_Moths__Saturnia_pyri__9270.aspx
http://www.loc.gov/rr/scitech/mysteries/butterflymoth.html
http://maisonneuve.org/post/2012/06/28/grass-and-butterflies-van-gogh-national-gallery/
http://www.nationalgallery.org.uk/paintings/vincent-van-gogh-long-grass-with-butterflies
http://www.plantwise.org/KnowledgeBank/Datasheet.aspx?dsid=51990
http://www.psmicrographs.co.uk/great-peacock-moth--saturnia-pyri-/science-image/peacock-moth
http://www.theguardian.com/artanddesign/2010/jan/15/van-gogh-his-own-words
http://www.vangoghgallery.com/misc/biography.html
http://www.vangoghmuseum.nl/vgm/index.jsp?page=2914&lang=en
http://en.wikipedia.org/wiki/Butterflies_(Van_Gogh_series)#Groupings_of_butterfly_and_garden_paintings
http://en.wikipedia.org/wiki/Pieris_rapae
http://en.wikipedia.org/wiki/Saturnia_pyri
http://en.wikipedia.org/wiki/Saturniidae