1.

電子ブック
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1. Developments in Demography in the 21st Century. 1st ed. 2020
edited by Joachim Singelmann, Dudley L. Poston, Jr
出版情報: Cham : Springer International Publishing : Imprint: Springer, 2020
シリーズ名: The Springer Series on Demographic Methods and Population Analysis ; 48
オンライン: https://doi.org/10.1007/978-3-030-26492-5
2.

電子ブック
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2. Census 2020 : Understanding the Issues. 1st ed. 2020
by Teresa A. Sullivan
出版情報: Cham : Springer International Publishing : Imprint: Springer, 2020
オンライン: https://doi.org/10.1007/978-3-030-40578-6