Science Research Centre, Queen Margaret University College, 2006 [2019-07-08], (原始内容 (PDF)存档于2015-02-11) Wells, John C.; Colson, Greta, Practical Phonetics
Current English. Oxford University Press. 2001: 980. ISBN 0-19-863156-1. Wells, J C. Longman Pronunciation Dictionary. Longman. 1990: 663. 维基共享资源上的相关多媒体资源:紹斯韋爾大教堂
LETTER U WITH HORN ,HTML:ư John C. Wells. Orthographic diacritics and multilingual computing. University College London. 2001 [9 December 2016]. (原始内容存档于2009-01-25)