If you can't find an exact match for the type of resource you want to reference in your referencing guide, don't worry. You just need to gather some information about your source and then create a reference by looking at similar resource types in the guide.You might even find two examples that would suit your reference if they were merged.
For instance, let's say you need to cite information from the back of a seed packet for your project. If you're unsure how to do it, you can ask for help from the library helpdesk. The librarian you talk to recommends checking the referencing guide for something similar. In this case, you're using Cite Them Right as your referencing guide. You'll find information on how to reference packaging, which is the closest match to the seed packet. The guide will show you what elements to include in your reference for packaging sources.
Manufacturer (Year seen) Product name [Medium].
You then adapt the guidance to create a full reference for your seed packet.
The intext citation would be:
The full reference would be:
Suttons (2022) Marigold French Seeds - Red Brocade [Seed packet].
Elements which make up your reference:
Apply a method as close as possible to your referencing guide so your style is consistent. Identifying as much information as possible to construct your reference, and placing these elements in the right order and relevant format, will help others to locate the source you used.