@Article{579195,
     author = "Joanna Schmidt",
     title = "Nature of NGO Volunteers' and Employees' Motivation : Implications and Recommendations for Managerial Staff",
     year =  2016,
     volume =  14,
     number =  3 (1),
     journal =  Problemy Zarządzania,
     pages =  s. 45-69,
    }