Lange.Oskar. (1971). POLITICAL ECONOMY: PWN- POLISH SCIENTIFIC PUBLISHERS. WARSZAWA.
Citazione stile Chigago Style (17a edizione)Lange.Oskar. POLITICAL ECONOMY: PWN- POLISH SCIENTIFIC PUBLISHERS. panstwowe wydawnictwo naukowe: WARSZAWA, 1971.
Citatione MLA (9a ed.)Lange.Oskar. POLITICAL ECONOMY: PWN- POLISH SCIENTIFIC PUBLISHERS. WARSZAWA, 1971.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.