http://immigrationtounitedstates.org/491-farm-and-migrant-workers.html
http://dcc.newberry.org/collections/immigration-and-citizenship
http://immigrationtounitedstates.org/497-filipino-immigrants.html
http://www.encyclopedia.com/social-sciences-and-law/sociology-and-social-reform/sociology-general-terms-and-concepts-3
http://www.hoover.org/research/making-and-remaking-america-immigration-united-states
http://dcc.newberry.org/collections/immigration-and-citizenship
http://immigrationtounitedstates.org/497-filipino-immigrants.html
http://www.encyclopedia.com/social-sciences-and-law/sociology-and-social-reform/sociology-general-terms-and-concepts-3
http://www.hoover.org/research/making-and-remaking-america-immigration-united-states