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1 Kratzer, Angelika, "Words, Worlds, and Contexts, New Approaches to Word Semantics" Walter de Gruyter 38-74, 1981
2 von Fintel, Kai, "Time and modality" Springer 115-141, 2008
3 Kaufmann, Stefan, "The Limit Assumption" 10 (10): 2017
4 Lee, Hyo Sang, "The Handbook of Korean Linguistics" John Wiley & Sons, Inc. 2015
5 Wymann, Adrian Thomas, "The Expression of Modality in Korean" Universit¨at Bern 1996
6 Zimmerman, Michael J., "The Concept of Moral Obligation" Cambridge University Press 1996
7 Crisp, Roger, "Supererogation and Virtue" 3 : 13-34, 2013
8 Heyd, David, "Supererogation" Cambridge University Press 1982
9 Kratzer, Angelika, "Semantics: An international handbook of contemporary research" de Gruyter 639-650, 1991
10 Ramchand, Gillian Catriona, "Semantics and Linguistic Theory, volume 24" 102-121, 2014
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12 Pybus, Elizabeth M., "Saints and Heroes" 57 : 193-199, 1982
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18 Ammann, Andreas, "Korean Modality – Asymmetries between Necessity and Possibility" 101-115, 2002
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21 Chung, WooJin, "Intervention in deontic reasoning" 13 (13): 1-49, 2020
22 Lassiter, Daniel, "Graded modality: Qualitative and quantitative perspectives" Oxford University Press 2017
23 Cohen, Shlomo, "Forced Supererogation" 23 : 1006-1024, 2015
24 Feldman, Fred, "Doing the Best We Can: An Essay in Informal Deontic Logic, volume 35" Springer Science & Business Media 1986
25 Chung, WooJin, "Decomposing Deontic Modality: Evidence from Korean" 36 (36): 665-700, 2019
26 Lewis, David, "Counterfactuals" Oxford University Press 1973
27 Richards, David A. J., "A Theory of Reasons for Action" Clarendon Press 1971
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