Carver, J. S. (1976). Systems of demographic measurement: The dual record system. International Program of Laboratories for Population Statistics, Dept. of Biostatistics, Carolina Population Center, University of North Carolina at Chapel Hill.
Lua i Stíl Chicago (17ú heag.)Carver, Jane S. Systems of Demographic Measurement: The Dual Record System. Chapel Hill: International Program of Laboratories for Population Statistics, Dept. of Biostatistics, Carolina Population Center, University of North Carolina at Chapel Hill, 1976.
Lua MLA (9ú heag.)Carver, Jane S. Systems of Demographic Measurement: The Dual Record System. International Program of Laboratories for Population Statistics, Dept. of Biostatistics, Carolina Population Center, University of North Carolina at Chapel Hill, 1976.