Chronological classification of roemers with the help of 17th century paintings in the Low Countries - Brongers, J. A. (Johannes Ayolt), 1933-; Wijnman, H. F. (Hendrik Fredrik), 1894-1979 (Amersfoort : ROB, 1968)
Repr.: Rotterdam papers: a contribution to medieval archaeology, Rotterdam, 1968, p. 15-22