> For the complete documentation index, see [llms.txt](https://docs.totalmateria.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.totalmateria.com/total-materia-integrator/creator/data-maintenance/reference-types.md).
# Reference Types
Organize and customize your material data by categorizing it into various reference types like Experimental, Standard, Internal standards or any desired name.
To create a new Reference type or edit/delete an existing one, click the "ADD REFERENCE TYPE" or buttons in the interface. This will open a window in which the "Reference type" (mandatory) and optional "Description" are defined.
Figure 1: Screenshot of Edit Reference Type in Data Maintenance section