Press, 2011 [2016-10-11], ISBN 0-19-852758-6, (原始内容存档于2020-07-27) Shorrocks, Graham, A Grammar of the Dialect of the Bolton Area: Introduction, phonology
Derek E.; Mineur, Frédéric; Muller, Zoe; Ogden, Rob; Seymour, Russell; Shorrocks, Bryan; Tutchings, Andy. How many species of giraffe are there?. Current