Free tool
Which citation format does this source need?
Paste a DOI, URL or ISBN and get the reference plus the in-text form — in the style your course requires.
Try the calculator
Writing
What the formatter produces
Enter the pieces of a source once and get a reference in APA, MLA and Chicago style plus an in-text form. The fields mirror what a DOI record or a journal page gives you.
Why a DOI beats a page title
DOI records carry the authoritative authors, year, journal and pages. Citations built from a search-result title usually get the year or the author order wrong, which is exactly what markers check.
Who it is for
Students and researchers formatting a paper on a deadline, and anyone who needs one consistent reference list rather than four styles copied from different guides.
Frequently asked questions
Does it fetch data from a DOI?
No. It formats the fields you enter, entirely in your browser. Copy the author, year, title and container from the DOI record first.
Which style should I use?
Use the style your course or journal requires. APA is common in social sciences, MLA in humanities, Chicago in history and some publishing contexts.
Are the formats exhaustive?
No. They cover the common journal-article case. Books, chapters, websites and datasets have extra rules; check your style guide for those.