They are called Harvard and Vancouver.

If you are writing an article, a project, a university paper, a paper for the journal or a book – ask you publisher, university or educational organisation which system they use.   Ask publishers for their “house style” guide.   It’s better being clear about this right from the start – otherwise, you will have spent ages including references and things, only to have to painfully edit them once you realised you’ve been using the wrong system.

So, be clear right from the start.