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APA Citation Style, Seventh Edition

Section 10.16

In General:
  • When the webpage you are citing does not indicate a date, use "n.d." instead of the year in both the in-text citations and reference entries.


General Format 
      In-Text Citation (Paraphrase): 
      (Author Surname, Year)
      In-Text Citation (Quotation):
(Author Surname, Year, Page or Paragraph Number [if available])
Author Surname, First Initial. Second Initial. (Year, Month Day [if known]). Title of webpage. Site Name. https://URL OR Retrieved Month Day, Year, from https://URL
NOTE: Only include retrieval dates when the webpage you are citing is likely to change with time (e.g., Wikipedia articles).
       In-Text Citation (Paraphrase): 
      (The Cornell Lab, n.d.)
       In-Text Citation (Quotation):
      (The Cornell Lab, n.d., para. 2)
The Cornell Lab. (n.d.). Citizen science.
NOTE: When the group author and the website name are the same, include only the author.