We try to write a new preCICE referential paper every 2-3 years. For the current version please use:
Bungartz, H.J., Lindner, F., Gatzhammer, B., Mehl, M., Scheufele, K., Shukaev, A. and Uekermann, B., 2016. preCICE–a fully parallel library for multi-physics surface coupling. Computers & Fluids , 141 , pp. 250-258.
You can get a bibtex from here: https://www.precice.org/publications/
Of course, for specific aspects or adapters, there is additional literature. Have a look at our literature guide.