Only Patrons See New Articles; Become a Patron Now!Ludwig Beckmann Examines a Rat King (sources)
- "The Rat King," article in the Scientific American Supplement, No. 234, June 26, 1880. Pgs. 3728-3729. Online: https://books.google.com/books?id=quw8AQAAIAAJ&pg=PA3728&lpg=PA3728&dq=%22Ludwig+Beckmann%22+%22rat+king%22&source=bl&ots=U8VJXl2Ab9&sig=QTAWJbPRPn8Mx3llh1k2Zv3AwFc&hl=en&sa=X&ved=2ahUKEwi1qNLiksPdAhWiFzQIHVeSABEQ6AEwAXoECAEQAQ#v=onepage&q=%22Ludwig%20Beckmann%22%20%22rat%20king%22&f=false
- "Ludwig Beckmann," page in the Wikimedia Commons, viewed 9-17-2018. Online: https://commons.wikimedia.org/wiki/Category:Ludwig_Beckmann
- "Art Gossip from the Old World," article in Brush and Pencil: An Illustrated Magazine of the Arts To-Day, Vol. XI, October 1902 to March 1903, 1903 Chicago, Illinois, USA. Pg. 73. Online: https://books.google.com/books?id=O3U2AQAAMAAJ&pg=PA73&lpg=PA73&dq=%22ludwig+beckmann%22+%22painter%22&source=bl&ots=T2PQANmSMq&sig=jg5aLWrOFSDtUiTQcTKALcbso0E&hl=en&sa=X&ved=2ahUKEwjTs-PrxMXdAhVBllQKHdSoD_sQ6AEwCHoECAcQAQ#v=onepage&q=%22ludwig%20beckmann%22%20%22painter%22&f=false
