Cerco de Constantinopla (626) (Portuguese Wikipedia)

Analysis of information sources in references of the Wikipedia article "Cerco de Constantinopla (626)" in Portuguese language version.

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Norwich 1997, p. 90. Norwich, John Julius (1997). A Short History of Byzantium (em inglês). New York, New York: Alfred A. Knoff. ISBN 0-679-45088-2
Kaegi 2003, p. 133. Kaegi, Walter Emil (2003). Heraclius: Emperor of Byzantium (em inglês). Cambridge, United Kingdom: Cambridge University Press. ISBN 0-521-81459-6
Norwich 1997, p. 92. Norwich, John Julius (1997). A Short History of Byzantium (em inglês). New York, New York: Alfred A. Knoff. ISBN 0-679-45088-2
Norwich 1997, p. 93. Norwich, John Julius (1997). A Short History of Byzantium (em inglês). New York, New York: Alfred A. Knoff. ISBN 0-679-45088-2
Kaegi 2003, p. 140. Kaegi, Walter Emil (2003). Heraclius: Emperor of Byzantium (em inglês). Cambridge, United Kingdom: Cambridge University Press. ISBN 0-521-81459-6