루트비히 4세 (신성 로마 황제) (Korean Wikipedia)

Analysis of information sources in references of the Wikipedia article "루트비히 4세 (신성 로마 황제)" in Korean language version.

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worldcat.org

Blockmans, Wim (2007). 《Introduction to medieval Europe, 300-1550》. London. ISBN 0-415-34699-1.