Lewis Michael. (2017). Undoing Project: Friendship that Changed the World. Penguin Books.
Chicago-čujuhus (17. p.)Lewis Michael. Undoing Project: Friendship That Changed the World. Penguin Books, 2017.
MLA-čujuhus (9. p.)Lewis Michael. Undoing Project: Friendship That Changed the World. Penguin Books, 2017.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.