一いち次じ資し料りょう

noun

primary source

Used in academic and research contexts to refer to original documents, raw data, or firsthand accounts that have not been interpreted or filtered by others.

• 歴れき史し研けん究きゅうでは一いち次じ資し料りょうが最もっとも信しん頼らいできる。

  In historical research, primary sources are the most reliable.

• この論ろん文ぶんは一いち次じ資し料りょうに基もとづいている。

  This paper is based on primary sources.