Assessment of Anxiety . Don't use footnotes. Psychological Abstracts . Available both as a journal and on computer, contains summaries of the world's literature in psychology. Will not identify all relevant articles on a topic.
Computerized version is available only for specific years.
If all else fails, check Educational and Psychological Measurement . Mental Measurements Yearbooks. Formerly edited by O.K. Buros. They are neither cumulative nor exhaustive, but are very useful. Be sure to look at one of them.