The entire year of 2013 is reproduced on this sheet of eight wallet-sized calendars. They are about the size of a credit card and can be easily printed on paper or cardstock and then cut apart. Free to download and print.
This free calendar is available in two versions: PDF (for Adobe Acrobat) and DOC (for Microsoft Word).
The PDF version: just download it, open it in Acrobat (or another program that can display the PDF file format,) and print.
The DOC version can be edited — adding your own events, for example. It is compatible with Microsoft Word, Google Docs, and any other word processing app that's compatible with the Microsoft Word .DOC format.