Reddit reviews Sigmund Ringeck's Knightly Art of the Longsword
We found 2 Reddit comments about Sigmund Ringeck's Knightly Art of the Longsword. Here are the top ones, ranked by their Reddit score.
This is decent. Take the drawings and mechanics with a grain of salt, but it presents the materials in a comprehensive fashion.
http://www.amazon.com/Sigmund-Ringecks-Knightly-Art-Longsword/dp/1581606885
Dimicator on facebook is one place for pretty great info on sword and buckler.
As for books... You could go with the pretty outdated Sword and Buckler book from Chivalry Bookshelf. Found here on Amazon.
Then there is new book (BTW thanks for having me look this up, I didn't even know this existed)
Next in line would be Manciolino.
You could also try looking at Lignitzer through Wiktenauer.com. That is going to more updated than David Lindholm's books (two links btw), or Christian Tobler's. But, it is nice to have physical copies.