Cables, Diamonds, & Herringbone: Secrets of Knitting Traditional Fishermen's Sweaters: Sabine Domnick. A reasonably comprehensive presentation, notwithstanding a relative shortage of available information.
From the Archives - Island life North of the border, Och aye Similar to the Yorkshire coast Gansey sweaters but generally hand knitted in a finer 3 or 4 ply wool yarn. Check back soon for more from The Shetland Isles.
Traditional Knitting Patterns of the British Isles: Fisher Gansey Patterns of Scotland and the Scottish Fleet v. 2 by Michael R.R. Pearson,http://www.amazon.com/dp/0906658055/ref=cm_sw_r_pi_dp_To42sb040C0H966G