ion. United Nations Department of Economic and Social Affairs Population Division - 1970 - Methods of measuring internal migration <a href="https://www.un.org/development/desa/pd/sites/www.un.org.development.desa.pd/files/files/documents/2020/Jan/manual_vi_methods_of_measuring_internal_migration.pdf" class="external-link">https://www.un.org/development/desa/pd/sites/www.un.org.development.desa.pd/files/files/documents/2020/Jan/manual_vi_methods_of_measuring_internal_migration.pdf</a></p>
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