XSLT Overview - Tutorialspoint

Best Online XML-XSLT Transformation

Free Online XSL Transformer (XSLT) - FreeFormatter.com

Dutchess-arc.org : Site Info

XML Tutorial 58 XSL Templates Pt 2 - YouTube

XSLT/Muenchian grouping - Wikipedia

Muenchian grouping (or Muenchian method, named after Steve Muench) is an algorithm for grouping of data used in XSL Transformations v1 that identifies keys in the results and then queries all nodes with that key.

XSLT <xsl:template> Element

Example Uses of XSL Subtemplates

XSLT elements - Wikipedia