What I would do is:
Evaluate the source. Is it from your own head/thoughts? Is it from your notes the teacher gave you? If it is, don't cite it.
Is the answer or source NOT from you and your own knowlege? Is it something that came from an external source, such as a book or website, cite it.
Better to cite than be accused of plagarism, so if you are unsure, I would cite it just to be safe.
Observation of life i think
Answer:
Viewpoint refers to the mind of the character through which the reader is told a story.
Explanation:
The multiple-character viewpoint is used to tell a story from the perspectives of different characters, one at a time
"It had a perfectly round door like a porthole" (page 15)
"They used to go up like great lilies and snapdragons and laburnums of fire and hang in the twilight all evening" (page 5)
"Because their feet grow natural leathery soles and thick warm brown hair like the stuff on their heads" (page 2)
"My armor is like tenfold shields..." (page 226)