Hugman, Barry J. (编). The PFA Footballers' Who's Who 2008–09. MainstreamPublishing. 2008: 319. ISBN 978-1-84596-324-8. National Football Teams (页面存档备份,存于互联网档案馆)
Hugman, Barry J. (编). The PFA Footballers' Who's Who 2010–11. MainstreamPublishing. 2010: 199. ISBN 978-1-84596-601-0. 存档副本. [2013-07-29]. (原始内容存档于2013-08-01)