ピーターバラ大聖堂
1 2 3 Sweeting, W.D (2004-10-05) [February 1898]. “Chapter 1. History of the Cathedral Church of St Peter”. In Bell, E. The Cathedral Church of Peterborough: A Description of its Fabric and a Brief History of the Episcopal See. Bell's Cathedrals (Project Gutenberg facsimile of the 1926 reprint of the 2nd Edition ed.). London: G. Bell and Sons. http://www.gutenberg.org/files/13618/13618-h/13618-h.htm#Page_3 2007年4月23日閲覧。
↑ Biddick, Kathleen (1989). “1 — Consumption and Pastoral Resources on the Early Medieval Estate”. The Other Economy: Pastoral Husbandry on a Medieval Estate. University of California Press. pp. p13. ISBN 0520063880. http://content.cdlib.org/xtf/view?docId=ft8199p22b&chunk.id=d0e203&toc.