Hiroki Oka
Shindai Mongoru monki seido no kenkyū
1911 ony Mongolyn ẏndėsniĭ khuvʹsgalyn urʹdkhilsan nokht͡sol ba olon ulsyn baĭdal- Facets of transformation of the Northeast Asian countries
- Idō to kyōsei no Tōhoku Ajia
- Mongolyn tu̇u̇kh, ugsaatny sudlalyn zarim asuudald
- Mongolyn tu̇u̇khiĭn sudalgaany shinė khandlaga, tulgamdsan asuudal
- Mongoru kenkyū ronshū
- Mongoru no kankyō to henʼyōsuru shakai
- Tōhoku Ajia
- 中央ユーラシア史研究入門