b. encyclopedia
In order to find a quick information on the causes of American civil war, you
must consult an encyclopedia.
An encyclopedia is one of the many type of information sources available that
students can retrieve information especially in research. An encyclopedia can
be a general one or a subject specific encyclopedia therefore it can be a book
or a series of books. The encyclopedia contains a sort of an overview or
a background of a specific subject that is being arranged alphabetically for
easy access and retrieval.
