एपीए उद्धरण

Headrick, D. R. (1981). The tools of empire: Technology and European imperialism in the nineteenth century. Oxford: Oxford University Press.

शिकागो स्टाइल उद्धरण

Headrick, Daniel R. The Tools of Empire: Technology and European Imperialism in the Nineteenth Century. Oxford: Oxford University Press, 1981.

एमएलए उद्धरण

Headrick, Daniel R. The Tools of Empire: Technology and European Imperialism in the Nineteenth Century. Oxford: Oxford University Press, 1981.