Indexes:

Narrower results, but often more relevant

Full-Text:

Broader results, less focused.

Much higher granularity, good for identifying theoretical approaches, or for criticism of a specific poem or short work.

General

Helpful for beginning research, and for interdisciplinary topics

Academic Search Premier

ProQuest Research Library

WorldCat

Scholar Search

Google Scholar

JSTOR

Project Muse

Discipline-Specific

MLA

Linguistics and Language Behavior Abstracts

Communications and Mass Media Complete

America:  History and Life

Historical Abstracts

Women’s Studies        International