Thanks to the many fans, historians, and relatives of former footballers for helping me accumulate the information on this website. Here are a few sites that have been particularly helpful in my research:

Doigs Den - History of Ned Doig
http://www.doigsden.co.uk/

LFChistory.net - Liverpool FC History
http://www.lfchistory.net/

Roker Roar - History of Sunderland FC
http://roker-roar.com/pauldays/navbar/index.html

The Scottish League - Forum
http://www.scottishleague.net/forum/

New York Public Library Digital Gallery
http://digitalgallery.nypl.org/nypldigital/index.cfm