Penrose, L. S.; Penrose, R. (February 1958). "Impossible Objects: A Special Type of Visual Illusion". British Journal of Psychology. 49 (1): 31–33. doi:10.1111/j.2044-8295.1958.tb00634.x. PMID13536303.
Hartvig, P. L.; Kjelsberg, E. (2009). "Penrose's Law revisited: The relationship between mental institution beds, prison population and crime rate". Nordic Journal of Psychiatry. 63 (1): 51–56. doi:10.1080/08039480802298697. hdl:10852/27918. PMID18985517. S2CID23873740.
Penrose, L. S. (March 1939). "Mental Disease and Crime: Outline of a Comparative Study of European Statistics". British Journal of Medical Psychology. 18 (1): 1–15. doi:10.1111/j.2044-8341.1939.tb00704.x.
Hartvig, P. L.; Kjelsberg, E. (2009). "Penrose's Law revisited: The relationship between mental institution beds, prison population and crime rate". Nordic Journal of Psychiatry. 63 (1): 51–56. doi:10.1080/08039480802298697. hdl:10852/27918. PMID18985517. S2CID23873740.
Penrose, L. S.; Penrose, R. (February 1958). "Impossible Objects: A Special Type of Visual Illusion". British Journal of Psychology. 49 (1): 31–33. doi:10.1111/j.2044-8295.1958.tb00634.x. PMID13536303.
Hartvig, P. L.; Kjelsberg, E. (2009). "Penrose's Law revisited: The relationship between mental institution beds, prison population and crime rate". Nordic Journal of Psychiatry. 63 (1): 51–56. doi:10.1080/08039480802298697. hdl:10852/27918. PMID18985517. S2CID23873740.
"Lionel Sharples Penrose Moncrieff". Munks Roll – Lives of the Fellows. VI. Royal College of Physicians: Royal College of Physicians: 375. 21 August 2013. Archived from the original on 28 December 2017. Retrieved 20 January 2018.
"Lionel Sharples Penrose Moncrieff". Munks Roll – Lives of the Fellows. VI. Royal College of Physicians: Royal College of Physicians: 375. 21 August 2013. Archived from the original on 28 December 2017. Retrieved 17 December 2017.
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Hartvig, P. L.; Kjelsberg, E. (2009). "Penrose's Law revisited: The relationship between mental institution beds, prison population and crime rate". Nordic Journal of Psychiatry. 63 (1): 51–56. doi:10.1080/08039480802298697. hdl:10852/27918. PMID18985517. S2CID23873740.
"Lionel Sharples Penrose Moncrieff". Munks Roll – Lives of the Fellows. VI. Royal College of Physicians: Royal College of Physicians: 375. 21 August 2013. Archived from the original on 28 December 2017. Retrieved 20 January 2018.
"Lionel Sharples Penrose Moncrieff". Munks Roll – Lives of the Fellows. VI. Royal College of Physicians: Royal College of Physicians: 375. 21 August 2013. Archived from the original on 28 December 2017. Retrieved 17 December 2017.