Fenn's source material

For Lecture 3. Alexander and Markov Theorems for Generalized Knots, I.

For Lecture 9. R.Fenn, Some 3-manifold theory and how it relates to knot theory.

For Lecture 11. R.Fenn, C.Rourke, Racks and Links in codimension two.

For Lecture 13. R.Fenn, Biracks and Virtual Knots.

For Lecture 15. R.Fenn, Surface Knots, Virtual Knots and Invariants.

For Lecture 17. R.Fenn, Virtual Knots, generalised braids and Invariants.
and a picture demostrating why the exchange move is unnecessary in certain cases, e.g. classic and welded knots.

For Lecture 19 by Dale Rolfsen. S.Bigelow, Braid groups are linear.