* A german book about functional programming in Haskell, Opal, ML and Gofer. [1] * Some introduction into "Communicating sequential processes" (I cannot recall which one) to get a proper concept about safe ways of multithreading. * "Linux for dummies" to get a firm understanding about unix, the shell etc.

[1] https://www.weltbild.at/artikel/buch/funktionale-programmier...