Research tool for the history of science, whose core dataset comes from bibliographical citations in the Isis Bibliography of the History of Science.

(Searches through citations, subject indexing, and abstracts)
Contains information about scholarly articles on the history and culture of the U. S. and Canada. (For World History, use Historical Abstracts)

(Searches through citations, subject indexing, and abstracts)
The primary place to find scholarship on world history. (For U.S. and Canadian History, use America: History and Life). Covers publications from 1955 - present.

(Searches through citations, subject indexing, and some full text)
Contains scholarly journals, trade publications, and magazines from across the disciplines and from popular culture. Much of the content is available in full text. An ELM Database.

(Searches through citations, subject indexing, and some full text)
A massive index of literature from the sciences, social sciences, and humanities. Also offers cited reference searching to see who has cited a particular document. 1898 - current.
Note: To do cited reference searching, click on "cited reference search," fill in an author's last name and publication date, figure out which of the resulting list of citations match the work you're looking for, and then "finish search" to see who has cited that work.