| The fate of Rome: Climate, disease, and the end of an empire K Harper Princeton University Press, 2018 | 746 | 2018 |
| Climate change during and after the Roman Empire: reconstructing the past from scientific and historical evidence M McCormick, U Büntgen, MA Cane, ER Cook, K Harper, P Huybers, T Litt, ... Journal of Interdisciplinary History 43 (2), 169-220, 2012 | 612 | 2012 |
| Slavery in the late Roman world, AD 275–425 K Harper Cambridge University Press, 2011 | 477 | 2011 |
| From shame to sin: The Christian transformation of sexual morality in late antiquity K Harper Harvard University Press, 2013 | 288 | 2013 |
| The infidel and the professor: David Hume, Adam Smith, and the friendship that shaped modern thought D Rasmussen Princeton University Press, 2018 | 240* | 2018 |
| Pandemics and passages to late antiquity: rethinking the plague of c. 249–270 described by Cyprian K Harper Journal of Roman Archaeology 28, 223-260, 2015 | 157 | 2015 |
| Measles virus and rinderpest virus divergence dated to the sixth century BCE A Düx, S Lequime, LV Patrono, B Vrancken, S Boral, JF Gogarten, ... Science 368 (6497), 1367-1370, 2020 | 120 | 2020 |
| People, plagues, and prices in the Roman world: the evidence from Egypt K Harper The Journal of Economic History 76 (3), 803-839, 2016 | 79 | 2016 |
| Porneia: The making of a Christian sexual norm K Harper Journal of Biblical Literature 131 (2), 363-383, 2012 | 78 | 2012 |
| Reconstructing the Roman climate K Harper, M McCormick The science of Roman history: Biology, climate, and the future of the past …, 2018 | 64 | 2018 |
| Slave prices in Late Antiquity (and in the very long term) K Harper Historia: Zeitschrift für Alte Geschichte, 206-238, 2010 | 57 | 2010 |
| The Greek census inscriptions of late antiquity K Harper The Journal of Roman Studies 98, 83-119, 2008 | 52 | 2008 |
| Plagues upon the Earth: Disease and the course of human history K Harper Princeton University Press, 2021 | 45 | 2021 |
| Comment l'Empire romain s' est effondré: le climat, les maladies et la chute de Rome K Harper, P Pignarre La Découverte, 2021 | 38 | 2021 |
| The environmental fall of the Roman Empire K Harper Daedalus 145 (2), 101-111, 2016 | 37 | 2016 |
| Another eyewitness to the plague described by Cyprian, with notes on the “Persecution of Decius” K Harper Journal of Roman Archaeology 29, 473-476, 2016 | 31 | 2016 |
| El fatal destino de Roma K Harper Editorial Crítica, 2019 | 29 | 2019 |
| The Fate of Rome: Climate K Harper Disease, and the End of an Empire (Princeton 2017), 2017 | 29 | 2017 |
| Il destino di Roma K Harper Einaudi, 2019 | 26 | 2019 |
| Marriage and family K Harper | 26 | 2012 |
