Hansen, Hans (2020). "Fallacies". The Stanford Encyclopedia of Philosophy. Metaphysics Research Lab, Stanford University. Archived from the original on 29 March 2021. Retrieved 13 March 2021.
Koons, Robert (2017). "Defeasible Reasoning". The Stanford Encyclopedia of Philosophy. Metaphysics Research Lab, Stanford University. Archived from the original on 15 March 2023. Retrieved 13 March 2021.
Hansen, Hans (2020). "Fallacies". The Stanford Encyclopedia of Philosophy. Metaphysics Research Lab, Stanford University. Archived from the original on 29 March 2021. Retrieved 13 March 2021.
Koons, Robert (2017). "Defeasible Reasoning". The Stanford Encyclopedia of Philosophy. Metaphysics Research Lab, Stanford University. Archived from the original on 15 March 2023. Retrieved 13 March 2021.