Krupska, B. (1976). School and lifelong education. Polish Scientific Publishers.
Citazione stile Chigago Style (17a edizione)Krupska, Beata. School and Lifelong Education. Warsaw: Polish Scientific Publishers, 1976.
Citatione MLA (9a ed.)Krupska, Beata. School and Lifelong Education. Polish Scientific Publishers, 1976.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.