@Article{432680,
     author = "Jarosław Strzelecki",
     title = "Prawdokrzew (Truth Tree) – logika dla humanistów = Truth Tree – Logic for Humanists",
     year =  2011,
     volume =  17,
     number =  ,
     journal =  Humanistyka i Przyrodoznawstwo,
     pages =  s. 83-106,
    }