Bad Days in History   by Michael Farquhar
   - A Gleefully Grim Chronicle of Misfortune, Mayhem, and Misery for Every Day of the Year
 (National Geographic Books; ISBN: 978-1-4262-1268-0 (hardcover) and 978-1-4262-1280-2 (ebook); April 21, 2015; $26)
Bad Days in History
National Geographic press room:
p156-157 に Badfinger's Manager Came and Got It (April 24, 1975) の項目あり