DataCite is an international not-for-profit organization which aims to improve data citation.
Although DataCite members can assign digital object identifiers (DOIs) to data sets, you do not need to be a DataCite member to get a reference from a DOI appropriately formatted to the journal you are planning to submit your manuscript.
Scroll down to Get started with DataCite:
Click on Generate your references automatically ... and you will be redirected to the main search page:
Paste your DOI, select the formatting style, and click on Format:
For example, for the formatting style of the journal Ecology, the reference corresponding to that DOI will read as:
Then, you can copy and paste the bibliographic reference in the reference list of your manuscript.
Quite easy, isn't it?