BINNICK, R.I. (1991). Time and the Verb - A Guide to Tense and Aspect.New York/Oxford: Oxford University Press.
2.
FUJITANI, N. (1938, originally, 1767). Kazashishoo [Studies of Function Words]. Edited by K. Fukui. Kokugogaku Taikei: GohooSooki [An Outline of Japanese Linguistics: An Introduction to Usage]. Vol. 1. Tokyo: Kooseikaku.
3.
HALLIDAY, M.A. K. (1970). Functional diversity in language as seen from a consideration of modality and mood in English. Foundations of Language, 6, 322–361.
4.
KAMIO, A. (1979). On the notion speaker's territory of information: A functional analysis of certain sentence-final forms in Japanese. In G. Bedell, E. Kobayashi, and M. Muraki (eds.), Explorations in Linguistics: Papers in Honor of Kazuko Inoue (pp. 213–231). Tokyo: Kenkyuusha.
5.
LAKOFF, R. (1972). The pragmatics of modality. In Paul N. Peranteau, Judith N. Levi, and Gloria C. Phares (eds.), Papers from the Eighth Regional Meeting of the Chicago Linguistics Society (pp. 229--246). Chicago Linguistic Society, University of Chicago.
6.
LYONS, J. (1977). Semantics. Vol. 1 and 2. Cambridge, U. K.: Cambridge University Press.
7.
NISHIDA, K. (1949, originally 1926). Basho [Field (of consciousness)]. In Y. Abe, T. Amano, T. Watsuji, T. Yamauchi, R. Mutai, M. Kohsaka, and T. Shimomura (eds.), Nishida Kitaroo Zenshuu [Complete Works of Kitaroo Nishida], Vol. 4 (pp. 208–298). Tokyo: Iwanami Shoten.
8.
PALMER, F.M. (1986). Mood and Modality.Cambridge, U. K.: Cambridge University Press.
9.
SCHIFFRIN, D. (1987). Discourse Markers.Cambridge, U. K.: Cambridge University Press.
10.
SUZUKI, A. (1979, originally 1824). Gengyo Shishuron [Studies of Four Parts of Speech]. Edited by T. Kojima and M. Tsuboi. Benseisha Bunko, #68. Tokyo: Bunseisha.
11.
TOKIEDA, M. (1941). Kokugogaku Genron [Principles of Japanese Linguistics].Tokyo: Iwanami.
12.
WATANABE, M. (1968). Shuujoshi no bunpooronteki imi [Grammatical Meanings of Sentence-Final Particles]. Kokugogaku [Japanese Linguistics], 72, 127–135.
13.
YAMADA, Y. (1936). Nihon Bunpoogaku Gairon [An Introduction to the Study of Japanese Grammar].Tokyo: Hoobunkan.