As you research a topic for a class assignment, you may find these links useful.

Encyclopaedia Britannica Middle School Edition
http://libraries.state.ma.us/login?db=eb_ms&locid=mlin_n_stonms

Encyclopaedia Britannica High School Edition

http://libraries.state.ma.us/login?db=eb_hs&locid=mlin_n_stonms

Encyclopaedia Britannica Elementary School Edition 

http://libraries.state.ma.us/login?db=eb_es&locid=mlin_n_stonms

Spanish Edition: Escolar K-8

http://libraries.state.ma.us/login?db=eb_escolar&locid=mlin_n_stonms

World Data Analyst (current and historical statistics on the countries of the world)

http://libraries.state.ma.us/login?db=eb_world&locid=mlin_n_stonms 

Annals of America (online access to original source documents from U.S. history)

http://libraries.state.ma.us/login?db=eb_america&locid=mlin_n_stonms

DeweyBrowse - sorts web sites according to the Dewey Decimal System:	Great Web Sites for Kids
Internet Library -information you can trust!	"GALE" Gale®, best known for its accurate and authoritative reference content, maintains more than 600 databases.

In addition, there are tools here to create a works cited page, or bibliography .
With any assignement, the Middle School expects you to provide complete bibliographies for all references including the internet.