Sociology dictionaries and encyclopedias can help you to: 

• define terminology related to the study of Sociology.
• find brief, factual information to supplement your research.

Handbooks provide an in-depth introduction to sociology topics:

Blackwell companions to sociology

Oxford Reference Online
Subject titles from Oxford University Press - searchable as a set, in subject groups, or by individual title.

Sage Reference Online 
A selection of encyclopedias covering business, communication, health, psychology, science and sociology.

Sage Research Methods Online
Research methodology and design

Te Ara
New Zealand encyclopedia

Theory

Special topics