"Linnaeus' Floral Clock". The Linnean Society of London. March 2013. Archived from the original on February 1, 2014. Retrieved January 17, 2014.
BG Gardiner (2007). "Linnaeus' Floral Clock"(PDF). The Linnean Society of London. Archived from the original(PDF) on December 12, 2013. Retrieved January 17, 2014.
"Linnaeus' Floral Clock". The Linnean Society of London. March 2013. Archived from the original on February 1, 2014. Retrieved January 17, 2014.
BG Gardiner (2007). "Linnaeus' Floral Clock"(PDF). The Linnean Society of London. Archived from the original(PDF) on December 12, 2013. Retrieved January 17, 2014.