"Alex Lockwood". University of Sunderland (به انگلیسی). Archived from the original on 20 اكتبر 2019. Retrieved 2019-10-20. {{cite web}}: Check date values in: |archive-date= (help)
"Alex Lockwood". University of Sunderland (به انگلیسی). Archived from the original on 20 اكتبر 2019. Retrieved 2019-10-20. {{cite web}}: Check date values in: |archive-date= (help)