Where should it go?

I've been working on this book cover today.

 I'm thinking of self-publishing it in an 8.5" x 11" format. The manuscript has been in my file drawer for years. There are lots of knitters nowadays and I think the time might be right to get it out in the market. It combines knitting and weaving using very basic materials -- a "loom board," and a tapestry needle. You can make knitted and woven pieces, such as woven mittens with knitted cuffs, or a sweater with a woven collar.

After I finished the cover mock-up I began wondering where to put an apostrophe. Should it be Knitter's Weaving Book, or Knitters' Weaving Book, or (skip the apostrophe) Knitters Weaving Book? What do you think?

Ghost of a needle

"The needle is among the oldest of artifacts, and its usefulness is without question. ... Needles can be thought of as headless pins with a single eye meant to pass readily through anything from the hem of a veil to the hide of a camel, leaving behind only a thread of a clue to their presence. When fully sewn into a garment, a piece of thread can be thought of as a continuous and flexible ghost of a needle. ..."
From The Evolution of Useful Things by Henry Petroski.