Which source would include a wide variety of aspects and information regarding a particular subject?

Question

Quizplus · Accepted Answer

An encyclopedia is a set of books that give information on many topics, or many aspects of one subject. Therefore, it could be used as a source that would provide a wide variety of information on a particular subject.
A library online catalog is incorrect. While a library online catalog would be consulted for information on finding a given book, it could not provide information regarding a particular subject itself. 
An English textbook is incorrect. An English textbook could be consulted for doubts regarding the English language and grammar. It would not provide a wide variety of aspects and information regarding a particular subject. 
A thesaurus is incorrect. A thesaurus is a tool that lists words in groups of synonyms. It would not provide information regarding a specific subject, as it deals primary with words.

Which Source Would Include a Wide Variety of Aspects and Information