'Eere Tentoonstelling H.J. Haverman' in Pulchri Studio 's-Gravenhage, dec. 1918 — 1918. Édition, PHI-E-000000000727. Philemone, version publique 1, publiée le 2026-10-10. https://philemone.com/editions/PHI-E-000000000727/eere-tentoonstelling-h-j-haverman-in-pulchri-studio-s-gravenhage-dec-1918-1918 (consulté le 2026-10-28).