Cushman, J. A. (1939). Monograph of the foraminiferal family nonionidae. Geological survey.
シカゴスタイル引用形Cushman, Joseph A. Monograph of the Foraminiferal Family Nonionidae. Washinton: Geological survey, 1939.
MLA引用形式Cushman, Joseph A. Monograph of the Foraminiferal Family Nonionidae. Geological survey, 1939.
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