„empire”. Collins English Dictionary. 2018. Приступљено 26. 10. 2018. „government by an emperor or empress”
doi.org
Taagepera, Rein (1979). „Size and Duration of Empires: Growth-Decline Curves, 600 B.C. to 600 A.D.”. Social Science History. 3 (3/4): 117. JSTOR1170959. doi:10.2307/1170959.
jstor.org
Taagepera, Rein (1979). „Size and Duration of Empires: Growth-Decline Curves, 600 B.C. to 600 A.D.”. Social Science History. 3 (3/4): 117. JSTOR1170959. doi:10.2307/1170959.
„empire”. The Free Dictionary. Приступљено 26. 10. 2018. „any monarchy that for reasons of history, prestige, etc, has an emperor rather than a king as head of state”
vocabulary.com
„empire”. Vocabulary.com Dictionary. Приступљено 26. 10. 2018. „a monarchy with an emperor as head of state”
yourdictionary.com
„empire”. Your Dictionary. LoveToKnow, Corp. 2018. Приступљено 26. 10. 2018. „government by an emperor or empress”