van Sas, N., & Witte, E. (1992). Historical research in the low countries. Den Haag: Nederlands Historisch Genootschap.
Lua i Stíl Chicago (17ú heag.)van Sas, N.C.F., agus E. Witte. Historical Research in the Low Countries. Den Haag: Nederlands Historisch Genootschap, 1992.
Lua MLA (8ú heag.)van Sas, N.C.F., agus E. Witte. Historical Research in the Low Countries. Den Haag: Nederlands Historisch Genootschap, 1992.
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