Following the earlier national history Nihon Kōki (840), in 855 Emperor Saga ordered the compilation of the years since then. Primarily edited by Fujiwara no Yoshifusa and Haruzumi no Yoshitsuna, the text was completed in 869.
Written in Kanbun-style and contained within 20 volumes, the contents covered 18 years spanning 833 and 850. As opposed to the previous national histories, it is the first to cover a single reign, that of Emperor Ninmyō setting the model for future national histories.
- Ruijū Kokushi, a categorized and chronological history text of the Six National Histories; valuable resource in recreating lost contents of the Shoku Nihon Kōki
- Kubota, Jun (2007). Iwanami Nihon Koten Bungaku Jiten [Iwanami dictionary of Japanese classical literature] (in Japanese). Iwanami Shoten. ISBN 978-4-00-080310-6.
- Nihon Koten Bungaku Daijiten: Kan'yakuban [A Comprehensive Dictionary of Classical Japanese Literature: Concise Edition]. Tōkyō: Iwanami Shoten. 1986. ISBN 4-00-080067-1.