Seagull Bobby. (2019). Life-Changing Magic of Numbers. Penguin Random House, Virgin Book UK.
Citazione stile Chigago Style (17a edizione)Seagull Bobby. Life-Changing Magic of Numbers. London: Penguin Random House, Virgin Book UK, 2019.
Citatione MLA (9a ed.)Seagull Bobby. Life-Changing Magic of Numbers. Penguin Random House, Virgin Book UK, 2019.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.