For an in-text citation, you would need the author's name and the page number. For example... <span>Romantic poetry is characterized by the "spontaneous overflow of powerful feelings" (Wordsworth 263).</span>
It reveals why Jekyll looked so sad and would not join the men.
This means that he feels very drugged as if he had just taken an opioid or something. He hears a nightingale singing saying that the bird is spreading its happiness too much. He is also saying that he too is happy because he can hear the nightingale sing somewhere amidst the forest.
