The online MITgcm User Manual is hosted at readthedocs.org. A 
version is also available.
The User Manual is a work-in-progress and continually being updated. We welcome new contributions from the MITgcm user community! (click here for instructions on how to contribute to the manual)
Archived checkpoint release versions of the manual are saved at Zenodo.org.
The manual should be cited as:
https://doi.org/10.5281/zenodo.1409237
To get MITgcm up and running on your platform, see our documentation on how to get started with MITgcm (includes instructions on downloading, building, and running the code).
For new MITgcm users who want to learn how to set up the model and analyze output, we recommend starting with our introductory tutorial Barotropic Ocean Gyre.
Key papers charting the development of MITgcm can be found here.