The Physics Problem Solver
Research & Education Association & Max Fogiel
Riddles of the Sphinx: And Other Mathematical Puzzle Tales
Martin Gardner
Problems and Solutions in Theoretical and Mathematical Physics
W.-H. Steeb
Encyclopedia of Ecology
Brian D. Fath
Shi'ism
Etan Kohlberg
Nachhaltige Nicht-Nachhaltigk[..] Warum Die ökologische Transformation ...
Ingolfur Blühdorn & Felix Butzlaff & Michael Deflorian & Daniel Hausknost & Mirijam Mock