Não informado. (1971). Historical Abstracts. American Bibliographical Center.
Chicagoスタイル(17版)引用形式Não informado. Historical Abstracts. Santa Barbara, Calif: American Bibliographical Center, 1971.
MLA(8版)引用形式Não informado. Historical Abstracts. American Bibliographical Center, 1971.
警告: この引用は必ずしも正確ではありません.