Answer:
The correct citation for a book with an author is: Wordsworth stated that romantic poetry was marked by a "spontaneous overflow of powerful feelings." (263).
Explanation:
According to the APA sixth edition style, when referencing a quotation within the text, you can choose to mention the name of the author within the sentence or in the parenthesis, not both.
In the example given in the question, the name of the author is already mentioned in the sentence, which is why, after the quotation, you just need to state the page number using parenthesis.
