Barlow, Patricia
Kluwer Law & Taxation, 1988
Buku Teks SO
American Immigration Lawyers Association, 1966
Buku Teks SO
American Immigration Lawyers Association, 1966
Buku Teks SO
George, Richard T. de, editor
Regents Press of Kansas, 1980
Buku Referensi
edited by J.W. Payne
John Wiley & Sons, 1980
Buku Teks SO