* I read an article in Newsweek about the latest political developments. (No punctuation needed if it's part of a longer phrase)
* I subscribed to Newsweek magazine. (No punctuation needed after "magazine")
* I like reading Newsweek, but I prefer The Economist. (Comma needed after "Newsweek" if it's a parenthetical phrase)
* Is there an article in Newsweek about climate change? (Question mark at the end of the sentence)
The punctuation will depend on the specific sentence and its grammatical structure.