An example of a personal communication reference in a paper is talking with r. urban (personal communication, October 31, 2014). Thus the correct answer is A.
All sources that a reader cannot retrieve are considered to constitute personal communication. Additionally, sources from personal communication may not have been publicly published or may only be accessible to a specific group of people.
A personal communication reference structure includes the initial of the author then name,then write in parentheses personal communication as well as the date of publication.
Therefore, option A is appropriate.
Learn more about the date of publication, here:
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