^William Tydeman; Thomas Norton; Thomas Kyd. Two Tudor Tragedies. Penguin Books. 1992: 268 [2014-01-21]. ISBN 9780140445312. (原始内容存档于2015-04-03). ...when Gorboduc was first presented, three-string versions featuring in painting of the 1530s, and the four-string version being perfected by Andrea Amati of Cremona (c. 1520-1611), from whom the French King, Francois II, ordered thirty-eight stringed instruments in 1560.