Blackwork: An Introduction - Survey article from Needle Pointers magazine XI:5, Winter 1983, by Carol Algie Higginbotham, EGA certified teacher of blackwork. Modern and traditional examples, bibliography, some free charts.
Blackwork Embroidery Archives - Collection of original floral and geometric patterns to download. Includes historical notes on blackwork in Renaissance costume, instructions for working double-running stitch, bibliography and links.
Blackwork Fill-in Patterns - Charted designs from sixteenth-century sources, with notes, at the Atlantian Embroiderers Guild (Society for Creative Anachronism).
Blackwork from Stitch On Line - History and techniques, early design sources, and bibliography, from the Skinner Sisters. Illustrated.
Blackwork Gallery - Annotated links to Renaissance portraits and paintings featuring blackwork, at the Elizabethan Practical Companion.