Website and chart data credits
A list of where the website is hosted and where the chart data comes from.
Website hosted at HostMedia , using Adobe ColdFusion pages with data served
from a mysql database.
1952-1960 - NME Singles Book
1961-1995 - Guinness Book Of Hit Singles 2nd Edition
1996-present - dotmusic.com, officialcharts.com
Various books and officialcharts.com
Billboard Hot 100s 1960s, 1970s, 1980s, 1990s, 2000s - Joel Whitburn (recordresearch.com )