Litwack, Leon, author
Prentice-Hall, 1962
Buku Teks
Kulischer, Eugene M.
International Labour Office , 1943
Buku Teks
edited by Reginald T. Appleyard
University of Western Australia, Centre for Migration and Development Studies, 1988
Buku Teks
Maideus, Melinda
Facts on File, 1981
Buku Teks
Appleyard, Reginald T., author
IOM, 1991
Buku Teks