1.5 : When should I use each type of information source?

1.5.1: I'm looking for basic information on a subject

What should I use?

Reference works: to find information on general concepts (encyclopaedia) or a particular word (dictionary).

Why?

Some reference works are only available in printed versions, so you will have to visit a library to access them.

1.5.2: I'm looking for a particular author's work or about a specific subject 

What should I use?

Why?