@incollection{debruijn:1981:ptc,
    author = {{de Bruijn}, N. G.},
     title = {{P}\'olya's Theory of Counting},
 booktitle = {Applied Combinatorial Mathematics},
    editor = {Beckenbach, Edwin F.},
 publisher = {Robert E. Krieger},
   address = {Malabar, FL},
     pages = {144–184},
      year = {1981},
      isbn = {0898741726}}