TANNER, A. Push and Pull in Migration – a Systems Approach Revisited in a Contemporary Context. Migration-Muuttoliike, [S. l.], v. 41, n. 1, p. 40–45, 2014. Disponível em: https://siirtolaisuus-migration.journal.fi/article/view/89923. Acesso em: 2 touko. 2024.