Albert Ampe  <br />Petrus Dorlandus O. Carth. en Dominicus van Gelre O.P.,  in: Anthonie R. A. Croiset van Uchelen (ed.), Hellinga Festschrift / Feestbundel / Mélanges. Forty-three studies in bibliography presented to Prof. Dr. Wytze Hellinga  ..., Amsterdam, 1980, 29-42  <br />[Ampe 1980]