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Sawyer & Wray 2014, m/s. 18. Sawyer, Caroline; Wray, Helena (Disember 2014). Country Report: United Kingdom (Laporan). Institut Universiti Eropah. hdl:1814/33839.
Sawyer & Wray 2014, m/s. 28. Sawyer, Caroline; Wray, Helena (Disember 2014). Country Report: United Kingdom (Laporan). Institut Universiti Eropah. hdl:1814/33839.
Sawyer & Wray 2014, m/s. 10. Sawyer, Caroline; Wray, Helena (Disember 2014). Country Report: United Kingdom (Laporan). Institut Universiti Eropah. hdl:1814/33839.
Sawyer & Wray 2014, m/s. 12. Sawyer, Caroline; Wray, Helena (Disember 2014). Country Report: United Kingdom (Laporan). Institut Universiti Eropah. hdl:1814/33839.