Agrawal, R. Nuts and bolts: Seven small inventions that changed the world in a big way. W.W. Norton & Company.
Chicago-referens (17:e uppl.)Agrawal, Roma. Nuts and Bolts: Seven Small Inventions That Changed the World in a Big Way. W.W. Norton & Company.
MLA-referens (9:e uppl.)Agrawal, Roma. Nuts and Bolts: Seven Small Inventions That Changed the World in a Big Way. W.W. Norton & Company.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.