Correct answer is d) experimental
Reference Books for Psychology
Psychology has its own unique vocabulary. These dicionaries and encylopedias can help with quick look-ups and in-depth topics.
Thesaurus of Psychological Indexing Terms
The official APA guide to subject indexing terms used in PsycInfo. The book is not available for free online, but you can use the thesaurus within PsycInfo to improve your searching.
Using the Thesaurus within PSYCInfo
Click on this subject icon at the top of the PsycInfo screen
Enter a word or phrase. For example, “free recall.”
The Thesaurus provides a definition of the term, as well as broader, narrower, and related subject headings. You can click on any of these links to launch a search (example below)