You can probably google a lot of good information on elements for CS. Or try documents generated by the WRC (Welding Research Council-a bit pricy) or the IIW (International Institute of Welding-free if you're a member). There is an excellent book by Evans and Bailey, though it is oriented to SMAW. Or Linnerts, Lancasters, Evans, or Granjon's volumes on Welding Metallurgy. There are excellent volumes available from TWI (The Welding Insititute-again a bit pricey) or Abbington Publishing (pricey as well)
The AWS handbook Volume 3 and 4. ASM's Volume 6 on Welding is huge and very comprehensive.