Final answer:
Sam is guilty of plagiarism and academic dishonesty, as he paraphrased an article without proper attribution, which is a violation of intellectual property.
Step-by-step explanation:
Sam is guilty of plagiarism. Plagiarism includes not just copying text word-for-word, but also paraphrasing someone else's work without proper attribution, even if the exact wording is not used.
By not including the article in his list of references, Sam has failed to give credit to the original author, which is a form of academic dishonesty and is both illegal and unethical.
Plagiarism is a violation of intellectual property and a serious matter in academic institutions, which can lead to consequences such as a loss of trust and academic penalties.