Which of the following are credible sources and why ?

1. A student who has just completed years studying Japanese literature prepares a paper on haiku.
2. A high school student puts his opinion on Emily Dickerson on the internet.
3. Denise Logan's publisher is interviewed about Logan attitude toward writing poetry.
4. Your friend, an exchange student from the town of Chile were Neruda was born, tells you what to prepare about the structure of Pablo Neuda's poetry.