Louis-Frédéric Nussbaum e Käthe Roth. (2005), "Fujiwara no Muchimaro" in Japan encyclopedia. (em inglês) Cambridge: Harvard University Press. p. 207 ISBN 9780674017535.
Brown, p. 274 n44; excerpt, "An office was established during Empress Kōken's reign but abolished after Nakamaro's death in 764."