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Harvard System由美國高校開始使用，后逐漸流傳到澳大利亞，新西蘭和英國等國家的大學內。是一種參考資料的格式，多用與自然科學還有物理化工類領域的專業dissertation。Harvard System（哈佛注釋體系），也被稱為Author-date method（作者－日期法），每一處引用，不論是直接引用又或者是間接的，都需要標注在文中引用處以及dissertation的bibliography（參考書目）。
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