Ujiié, H., and H. Watanabe, 1960, The Poronai foraminifera of the northern Ishikari Coal Field, Hokkaidô, Science Reports of the Tokyo Kyoiku Daigaku, Ser. C, Geology, Mineralogy and Geography 7(63):117-136.
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Ujiié, H., and H. Watanabe, 1960, The Poronai foraminifera of the northern Ishikari Coal Field, Hokkaidô, Science Reports of the Tokyo Kyoiku Daigaku, Ser. C, Geology, Mineralogy and Geography 7(63):117-136.