EBSCO provides K-12 research tools + business, health, & Spanish research tools & a Mobile interface for iPhones and iPods.  EBSCO  

 Sirs Discoverer is especially useful for health, science, technology, and social studies.

Research choices include Texas Almanac, Literature Resource Center, newspapers, professional resources and Resource Center Junior for Middle Schools. Gale

Provides access to videos, videoclips, images, & teacher resources such as lesson plans and blackline masters for all curriculum areas
streaming.discoveryeducation.com/index.cfm

www.school.eb.com

Annals of American History

Spanish Encyclopedia

Reference Desk is a free and family-friendly web site that indexes and reviews quality, credible, and current web-based resources
refdesk.com/index.html

For citation formats, go to:

jimned.region14.net/webs/lcross/bibliography_help.htm

citationmachine.net/

owl.english.purdue.edu/owl/resource/584/03/

K-12 Databases
This link provides access to all secondary databases with a description of the types of information you might find at each one.