Asano, K. (1936). Pseudononion, a New Genus of Foraminifera found in Muraoka-mura, Kamakura-gori, Kanagawa Prefecture. The Journal of the Geological Society of Japan. Vol. 43 No. 512 pp. 347-348., available online at (https://www.jstage.jst.go.jp/article/geosoc1893/43/512/43_512_347/_pdf) page(s): fig. A-C