Look at ICEAA - Cost Estimate / Analysis study book
or AACE - CCE/ CCP study books
Both of them have good base for estimating in general as well as techniques
I have these two books toohttps://www.amazon.com/gp/product/B014SZY9T0/ref=ppx_yo_dt_b_search_asin_image?ie=UTF8&psc=1
https://www.amazon.com/gp/product/0471857076/ref=ppx_yo_dt_b_search_asin_image?ie=UTF8&psc=1