citing postgresql?

hi all,

exists a common citation for the postgresql-project, like e.g. for the
R-project:


To cite R in publications, use

     @Manual{,
       title        = {R: A Language and Environment for Statistical
                       Computing},
       author       = {{R Development Core Team}},
       organization = {R Foundation for Statistical Computing},
       address      = {Vienna, Austria},
       year         = 2006,
       note         = {{ISBN} 3-900051-07-0},
       url          = {http://www.R-project.org}
     }


thanks for every help
christian