Strawson, Galen (1998, 2004). Free will. In E. Craig (Ed.), Routledge Encyclopedia of Philosophy. London: Routledge. Diakses pada 31 Juli 2009
Strawson, Galen (1998, 2004). Free will (section 2)Diarsipkan 2009-09-23 di Wayback Machine.. In E. Craig (Ed.), Routledge Encyclopedia of Philosophy. London: Routledge. Diakses pada 31 Juli 2009. "These anti-compatibilists or incompatibilists divide into two groups: the libertarians and the no-freedom theorists or pessimists about free will and moral responsibility."
Strawson, Galen (1998, 2004). Free will (section 2)Diarsipkan 2009-09-23 di Wayback Machine.. In E. Craig (Ed.), Routledge Encyclopedia of Philosophy. London: Routledge. Diakses pada 31 Juli 2009. "They [libertarians] hold (1) that we do have free will, (2) that free will is not compatible with determinism, and (3) that determinism is therefore false."
Strawson, Galen. "Free Will" di Routledge Encyclopedia of Philosophy, penyunting Edward Craig (1998); "The Bounds of Freedom" dalam The Oxford Handbook of Free Will, penyunting Robert Kane (2002).
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Timpe, Kevin (2006) Free Will di Feiser, J and Dowden, B (Eds.) 'Internet Encyclopedia of Philosophy'. Diakses pada 31 Juli 2009 "Other incompatibilists think that the actual world is not deterministic and that at least some of the agents in the actual world have free will. These incompatibilists are referred to as "libertarians" [lihat Kane (2005), terutama bab 3 dan 4]."
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Strawson, Galen (1998, 2004). Free will (section 2)Diarsipkan 2009-09-23 di Wayback Machine.. In E. Craig (Ed.), Routledge Encyclopedia of Philosophy. London: Routledge. Diakses pada 31 Juli 2009. "These anti-compatibilists or incompatibilists divide into two groups: the libertarians and the no-freedom theorists or pessimists about free will and moral responsibility."
Strawson, Galen (1998, 2004). Free will (section 2)Diarsipkan 2009-09-23 di Wayback Machine.. In E. Craig (Ed.), Routledge Encyclopedia of Philosophy. London: Routledge. Diakses pada 31 Juli 2009. "They [libertarians] hold (1) that we do have free will, (2) that free will is not compatible with determinism, and (3) that determinism is therefore false."