Day, L. H. (1978). What will ZPG society be like? Population Reference Bureau.
Chicagoスタイル(17版)引用形式Day, Lincoln H. What Will ZPG Society Be like? Washington: Population Reference Bureau, 1978.
MLA(9版)引用形式Day, Lincoln H. What Will ZPG Society Be like? Population Reference Bureau, 1978.
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