2 literature references for Soja japonica Savi:

Author: Hermann,F.J.
Year: 1962
Title:
Source: USDA Tech.Bull.1268.A revision of the genus Glycine...
Author: Teplyakova, Shcherlko,Korsakov
Year: 1994
Title:
Source: Sojabean. In:Floraof Cultivated Plants,2nd ed., Vol. 4,2.