Mann, Ludovic McLellan. “Notes (1) on Two Tribula or Threshing-Sledges, Having Their under Surfaces Studded With Rows of Chipped Flints, for Threshing Corn on a Threshing-Floor, from Cavalla in European Turkey, Now Presented to the Museum; And (2) on Primitive Implements and Weap”. Proceedings of the Society of Antiquaries of Scotland 38 (November 30, 1904): 506–519. Accessed April 26, 2024. https://journals.socantscot.org/index.php/psas/article/view/6991.