Final answer:
People use sources in an annoying way when they don't cite them correctly or clearly differentiate their thoughts from the information obtained from sources. Overusing quotations without incorporating one's own voice is another common mistake. It's important to use sources strategically and provide explanations or analysis for quotations to maintain one's own voice.
Step-by-step explanation:
When people use sources in an annoying way, it often means that they are not citing their sources correctly or clearly distinguishing their own thoughts from information derived from other sources. This can be seen when someone copies a passage from an Internet site into a paper without including quotation marks or author attribution. Another way is by overusing quotations and not incorporating one's own voice into the work. It's important to quote and paraphrase sources strategically and to always explain or analyze the quotations to avoid drowning out one's own voice.