Penn, R. (2016). The Man Who Made Things Out of Trees. Penguin.
Cita Chicago (17th ed.)Penn, Robert. The Man Who Made Things Out of Trees. Penguin, 2016.
Cita MLA (9th ed.)Penn, Robert. The Man Who Made Things Out of Trees. Penguin, 2016.
Atenció: Aquestes cites poden no estar 100% correctes.