The Thaumonomicon is the handbook for every Thaumaturge, containing every recipe discovered through research. To create the Thaumonomicon, you will need a wand like the Wand of the Apprentice.
Now you need a bookshelf, and the bookshelf recipe is the same as if it were in vanilla Minecraft.
Place the bookshelf down and right-click it with your wand and TA-DA! You have now made yourself a thaumonomicon.