@inbook {2005,
	title = {Nivelles. L{\textquoteright}ancienne coll{\'e}giale Sainte-Gertrude},
	booktitle = {Le Patrimoine m{\'e}di{\'e}val de Wallonie},
	series = {Patrimoine de Wallonie},
	number = {9},
	year = {2005},
	pages = {61-63},
	publisher = {Institut du patrimoine wallon},
	organization = {Institut du patrimoine wallon},
	address = {Namur},
	isbn = {978-2-9600421-2-2},
	author = {Donnay-Rocmans, Claudine},
	editor = {Maquet, Julien}
}
@inbook {2004,
	title = {Nivelles: La coll{\'e}giale Sainte-Gertrude},
	booktitle = {Le patrimoine exceptionnel de Wallonie},
	year = {2004},
	pages = {62-67},
	publisher = {Minist{\`e}re de la R{\'e}gion wallone},
	organization = {Minist{\`e}re de la R{\'e}gion wallone},
	address = {Namur},
	issn = {2-87401-172-X},
	author = {Donnay-Rocmans, Claudine},
	editor = {Deveseleer, Jacques}
}
