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; Encyclopedias and dictionaries
; Electronic encyclopedias
; Electronic reference sources
; Reference sources
; Grades 5-12
"As the Internet's premier collection of online encyclopedias, Encyclopedia.com provides you reference entries from credible, published sources like Oxford University Press and Columbia Encyclopedia.
At Encyclopedia.com, you get free access t[...]
; Electronic reference sources
; Electronic encyclopedias
; Almanacs, Children's
; Encyclopedias and dictionaries
; Reference sources
; Children's encyclopedias and dictionaries
; Reference sources for children
; Children's electronic reference sources
; Grades 3-6
; Grades 5-12
; Grades 5-10
Britannica School, a safe, up-to-date, and age-appropriate information resource for Elementary, Middle, and High School.
Discover encyclopedia articles, multimedia, primary sources, games, and other learning resources that support student res[...]
; Encyclopedias and dictionaries
; Reference sources
; Web services
; Electronic reference sources
; Databases
; Grades 5-10
; Grades 8-12
Source Reference integrates highly acclaimed reference content with instructional videos and tutorials to provide research instruction in the classroom and at the point of need. Prepare students for any kind of research or the rigors of academia[...]
20??-
; Teachers
; Teachers -- MYP/DP
; Teachers -- PYP
; Grades 5-10
; Physics -- Computer network resources
; Open educational resources
; Technology -- Study and teaching
; Social sciences -- Study and teaching
; Electronic reference sources
; Science -- Computer network resources
; History -- Computer network resources
; Art -- Computer network resources
ThoughtCo is a premier reference site with a 20+ year focus on expert-created education content. We are proud to be one of the top-10 information sites, as measured by comScore, a leading Internet measurement company. In 2018, ThoughtCo received[...]
2018-
; Electronic encyclopedias
; Electronic reference sources
; Biography -- Computer network resources
; Encyclopedias and dictionaries -- Computer network resources
; Grades 5-10
Infoplease is a reference and learning site, combining the contents of an encyclopedia, a dictionary, an atlas and several almanacs loaded with facts. Our editors update and regularly refine this enormous body of information to bring you reliabl[...]
; Grades 3-6
; Grades 5-10
; Grades 8-12
; Electronic reference sources
; Encyclopedias and dictionaries
; Reference sources
; Web services
; Electronic encyclopedias
; Children's electronic reference sources
Enciclopèdia.cat és el principal portal de continguts de referència en català. Un univers de continguts en continu creixement, amb més de 800.000 articles de 45 obres diferents i de temàtica molt diversa: llengua, història, economia, art, políti[...]
; Grades 3-6
; Teachers
; Grades 5-12
; Reference sources for children
; Electronic reference sources
; Open educational resources
El Departament d’Educació de la Generalitat de Catalunya i la Corporació Catalana de Ràdio i Televisió (en endavant CCRTV) han creat aquest Portal educatiu per posar a l’abast de tota la comunitat educativa i de la resta de ciutadans el material[...]