If you don't use citations it makes you look like your are plagiarizing another's work. Additionally, citations make it easier for the reader to understand where you got your information from (maybe they want to check its validity or perhaps research the topic for themselves).
You have worked five years in technical support
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Lincoln used a particular pattern where sentences would start with a preposition and end with a verb.
With the use of parallelism, he persuades people to listen by emphasizing the contents of his speech and balance them with the other contents of the speech.