If you use YT and would like to cite it in your paper, please feel free to cite the  SciPy 2008 Proceedings paper using this BibTeX snippet:

@InProceedings{SciPyProceedings_46,
  author =       {Matthew Turk},
  title =        {Analysis and Visualization of Multi-Scale Astrophysical Simulations Using Python and NumPy},
  booktitle =   {Proceedings of the 7th Python in Science Conference},
  pages =     {46 - 50},
  address = {Pasadena, CA USA},
  year =      {2008},
  editor =    {Ga\"el Varoquaux and Travis Vaught and Jarrod Millman},
}