Book Recommendation: Complex Traits and Complex Genetic Architecture
Suggestions:

Evolutionary Genetics : Concepts and Case Studies: Concepts and Case Studies

Edited by Lexington Charles W. Fox Department of Entomology University of Kentucky, Faculty of Life Sciences University of Manchester Jason B. Wolf Lecturer

The mathematical theory of selection, recombination, and mutation

by R Bürger (as suggested by @rg255 in the comments)    

Lynch and Walsh's Genetics and Analysis of Quantitative Traits

(as suggested by @kmm in the comments)

PS: Do tell us if you found a better one.