@inbook{402321,
     title = {2.6 George Kingsley Zipf},
     booktitle = {Historie matematick\'e lingvistiky},
     series = {GDML\_Books},
     publisher = {Akademick\'e nakladatelstv\'\i\ CERM v Brn\v e},
     address = {Brno},
     year = {2012},
     pages = {62-68},
     url = {http://dml.mathdoc.fr/item/402321}
}

 (éd.). 2.6 George Kingsley Zipf, dans Historie matematické lingvistiky, GDML_Books,  (2012), pp. 62-68. http://gdmltest.u-ga.fr/item/402321/