Pilcher, H. (2021). Small inventions that made a big difference: From prehistory to the present. Welbeck.
Chicago-Zitierstil (17. Ausg.)Pilcher, Helen. Small Inventions That Made a Big Difference: From Prehistory to the Present. London: Welbeck, 2021.
MLA-Zitierstil (9. Ausg.)Pilcher, Helen. Small Inventions That Made a Big Difference: From Prehistory to the Present. Welbeck, 2021.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.