APA-ийн эшлэл(7 дахь хэвлэлт)

HEADDRICK, D. R. (1981). The Tools of empire: Technology andEuropean imperialism in the nineteenth century. O.U.Pr.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

HEADDRICK, Daniel R. The Tools of Empire: Technology AndEuropean Imperialism in the Nineteenth Century. New York: O.U.Pr, 1981.

MLA -ийн эшлэл (9 дэх хэвлэлт)

HEADDRICK, Daniel R. The Tools of Empire: Technology AndEuropean Imperialism in the Nineteenth Century. O.U.Pr, 1981.