Final answer:
In the realm of drug information references, "ancillary" is not recognized as a standard type of reference. The recognized types are primary, secondary, and tertiary each serving different roles in providing drug-related information.
Step-by-step explanation:
The types of references used to access drug information include primary, secondary, and tertiary sources, but "ancillary" is not a type of reference in this context. Drug information references are categorized based on how the information is presented and its originality:
- Primary references are original research articles, clinical trial data, and case reports.
- Secondary references are resources like review articles and indexing/searching tools that summarize or organize information from primary literature.
- Tertiary references are condensed works such as textbooks, encyclopedias, and compendiums which provide compiled and distilled knowledge from primary and secondary sources.
The term "ancillary" does not fit as a category for drug information references, though it may be utilized in other contexts to refer to additional support or supplementary materials.