I'm on the home straight for my translation of Clemen's Meyer's Im Stein – although we don't have an English title yet. So I thought I'd share my extracurricular reading and reference works for the novel. In order of decreasing naivety.
The Oxford Dictionary of Nursery Rhymes
Let's Sing Together
The Penguin Rhyming Dictionary
It's all part of the job. Deutsch für die Polizei
A Dictionary of Marxist Thought
Karl Marx: Capital
Alfred Döblin: Berlin Alexanderplatz
Bobby Cummines: I Am Not a Gangster - Fixer. Armed robber. Hitman. OBE
William T. Vollmann: Whores for Gloria
Rachel Aimee, Eliyanna Kaiser, Audacia Ray (eds.): $pread. The best of the magazine that illuminated the sex industry and started a media revolution
Wolfgang Hilbig, I (trans. Isabel Cole)
David Peace: Tokyo Year Zero
Skip the Games: Escort terms, sex definitions and abbreviations in escort ads
I might have forgotten some.