OpenDevEd has been streamling our Google Docs / Sheets / Slides workflows for many years, going back almost until the initial launch of apps script. For more details about all our Add-ons, see Our Tools.
BZotero for Docs is a plugin for Google Docs, that offers an alternative workflow to the official Zotero plugin. In particular, it allows Zotero links to be embedded into Google Docs that point to a site built with Kerko app.
For details, visit our GitHub repository here google-apps-script/repositories and select BZotero for Docs.