The first time you mention a source, explain the author’s credentials, or the specific nature of the source. This is only necessary once in a document; keep subsequent mentions of a source as concise as possible.
First Mention Example
Jeff Bezos (2018), CEO of Amazon, in his 2017 letter to shareholders, argued that “[t]he great memos are written and re-written, shared with colleagues who are asked to improve the work, set aside for a couple of days, and then edited again with a fresh mind.”
Subsequent Mention Examples
Bezos (2018) noted that writing “a great memo probably should take a week or more.”
Since memos are written in teams at Amazon, everyone on the team doesn’t have to be a great writer, but everyone needs to “recognize high standards” for writing (Bezos, 2018).
References Page Entry
Bezos, J. (2018). 2017 letter to shareholders. Amazon. https://ir.aboutamazon.com/annual-reports-proxies-and-shareholder-letters/default.aspx