These databases provide some coverage of linguistics related articles. They often cover not only the journal literature but also include book chapters, dissertations, and conference proceedings. Depending on your topic, you may want to try:
Also try searching for linguistics related topics in other subject discipline databases that might relate to your topic (e.g. search for "political discourse" in the political science database, Worldwide Political Science Abstracts).
Consult Liz Cooper (firstname.lastname@example.org), the Social Sciences Librarian for linguistics, with any questions.
P1-1091 Philology. Linguistics
P87-96 Communication. Mass media
P94.7 Interpersonal communication
P95-95.6 Oral communication. Speech
P98-98.5 Computational linguistics. Natural language processing
P99-99.4 Semiotics. Signs and symbols P99.5-99.6 Nonverbal communication
P101-410 Language. Linguistic theory. Comparative grammar.
P118-118.75 Language acquisition
P121-149 Science of language (Linguistics)
P201-299 Comparative grammar
P301-301.5 Style. Composition. Rhetoric
P302-302.87 Discourse analysis
P306-310 Translating and interpreting
P375-381 Linguistic geography
P501-769 Indo-European (Indo-Germanic) philology
P901-1091 Extinct ancient or medieval languages