APA-čujuhus (7. p.)
Heck, G. W. (2006). Charlemagne, Muhammad, and the Arab roots of capitalism. De Gruyter.
Chicago-čujuhus (17. p.)
Heck, Gene W. Charlemagne, Muhammad, and the Arab Roots of Capitalism. Berlin ; New York: De Gruyter, 2006.
MLA-čujuhus (9. p.)
Heck, Gene W. Charlemagne, Muhammad, and the Arab Roots of Capitalism. De Gruyter, 2006.
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