I am trying to retrieve citations using the google scholar cite api. In the documentation the returned JSON has fields for MLA, APA, Chicago, Harvard and Vancouver formatted citations. However in my results I am only getting MLA, APA and ISO 690 format citations.
What is causing this discrepancy between the documentation and what I am getting back? I'm also confused about where the ISO 690 citation result comes from as this isn't an option when I use Google Scholar directly