After learning about encyclopedia and wikipedia, the pro and cons of each type of the resources are:
The informations are not accurate. Any one can edit the webpage and give wrong information about the topic but still it is little bit useful to use it as the background informations. I found 2 print encyclopedias on my topic. I went to the library webpage and type homosexual an encyclopedia. I collect the call number and searched in the refrence section. I found one E-encyclopedias on my topic. I went to library webpage and went to references and facts. I  typed "gay people and social acceptance" and I found it. I think encyclopedia is more appropriate for my research presentation becuase they are little bit accurate than wikipedia.