Hanson, A.H.
London Routledge & Kegan Paul 1959,
Buku Teks
Hansen, A. H.
Routledge , 1965
Buku Teks
Smith, Thomas C., author
Stanford University Press, 1955
Buku Teks
Cherlin, Andrew J., author
McGraw-Hill, 2002
Buku Teks
Jones, Charles O.
Brooksm, 1977
Buku Teks