Institut géographique national. (1969). Belgique 1:50 000: België 1:50 000 / National Geografisch Instituut = Belgien 1:50 000 / Nationalgeographisches Institut = Belgium 1:50 000 / National Geographical Institute. IGM.
Chicago Style (17th ed.) CitationInstitut géographique national. Belgique 1:50 000: België 1:50 000 / National Geografisch Instituut = Belgien 1:50 000 / Nationalgeographisches Institut = Belgium 1:50 000 / National Geographical Institute. Brussels: IGM, 1969.
MLA (8th ed.) CitationInstitut géographique national. Belgique 1:50 000: België 1:50 000 / National Geografisch Instituut = Belgien 1:50 000 / Nationalgeographisches Institut = Belgium 1:50 000 / National Geographical Institute. IGM, 1969.
Warning: These citations may not always be 100% accurate.