| Author(s): | Lehmann-Haupt, Hellmut |
| Title: | Gutenberg and the Master of the Playing Cards |
| City: | New Haven |
| Year: | 1966 |
| Page details: | fig. 1 |
| Author(s): | Verspaandonk, J.A.J.M. |
| Title: | Bolsward: De Martinikerk |
| City: | Amsterdam |
| Year: | 1974 |
| Journal/Volume: | Misericorde-reeks |
| Page details: | p. 146-147 |