AlbertoA.AlesinaAlbertoA., ArmandoA.MianoArmandoA., StefanieS.StantchevaStefanieS., Imigration and Redestibution [online], czerwiec 2018 [zarchiwizowane z adresu].
dropbox.com
AlbertoA.AlesinaAlbertoA., ArmandoA.MianoArmandoA., StefanieS.StantchevaStefanieS., Imigration and Redestibution [online], czerwiec 2018 [zarchiwizowane z adresu].
hamiltonproject.org
Immigrants Are Not A Net Drain On The 4. Federal Government Budget, [w:] MichaelM.GreenstoneMichaelM., AdamA.LooneyAdamA., Ten Economic Facts About Immigration, październik 2010. Brak numerów stron w książce