Any book recommendation for writing a compiler?

[Dr. Assembly]

On Wednesday, 1 November 2017 at 20:53:44 UTC, Dr. Assembly wrote:
> Hey guys, if I were to get into dmd's source code to play a 
> little bit (just for fun, no commercial use at all), which 
> books/resources do you recommend to start out?

I'd like something on back-end too, for example, code generation, 
convert the AST to actual assembly/machine code. On my research I 
found mostly front-end related stuff, like recursive descent 
parser.