Willis, K. G. (1974). Problems in migration analysis. Saxon House ; Lexington Books.
Lua i Stíl Chicago (17ú heag.)Willis, K. G. Problems in Migration Analysis. Farnborough : Lexington, Mass.: Saxon House ; Lexington Books, 1974.
Lua MLA (8ú heag.)Willis, K. G. Problems in Migration Analysis. Saxon House ; Lexington Books, 1974.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.