Reihe Great Thinkers in 60 Minutes Great Thinkers in 60 Minutes - Volume 1Plato, Rousseau, Smith, Kant, HegelWalther ZieglerBoD – Books on DemandSoftcover2017 Great Thinkers in 60 Minutes - Volume 2Marx, Freud, Sartre, Camus, HeideggerWalther ZieglerBoD – Books on DemandSoftcover2016