Pollard, S. (1971). The idea of progress: History and society. Penguin Books.
Citazione stile Chigago Style (17a edizione)Pollard, Sidney. The Idea of Progress: History and Society. [Harmondsworth, Eng.]: Penguin Books, 1971.
Citatione MLA (9a ed.)Pollard, Sidney. The Idea of Progress: History and Society. Penguin Books, 1971.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.