This link to the Zotero documentation offers many options for adding various types of items to your Zotero library without using the plug-in.
Here is the help page with info on the Library Lookup/OpenURL feature: https://www.zotero.org/support/locate
Here is the OpenURL that works for PennWest: https://klnpa-pennwest.primo.exlibrisgroup.com/discovery/openurl?institution=01SSHELCO_CUP&vid=01SSHELCO_CUP:PRIMO