Primary sources
Ministry of Foreign Affairs of Ukraine (mfa.gov.ua), State Migration Service (dmsu.gov.ua), State Employment Service (dcz.gov.ua), Unified State Register (EDR), Verkhovna Rada legislative database (zakon.rada.gov.ua).
Secondary sources
Cabinet of Ministers resolutions, ministerial orders, court decisions on migration matters published in the Unified Judicial Registry.
Pakistan-side sources
Ministry of Foreign Affairs of Pakistan, NADRA, HEC, Ministry of Overseas Pakistanis where relevant.