A Dictionary of Intermediate Japanese Grammar by Seiichi Makino and Michio Tsutsui English, Japanese | 2000 | ISBN: 4789007758 | 837 pages | scan PDF | 29,6 MB
Alexander Vovin, "A Descriptive and Comparative Grammar of Western Old Japanese (2 Vols): Revised, Updated and Enlarged Second Edition" English | ISBN: 9004422110 | 2020 | 1278 pages | PDF | 7 MB