Book: Aronson, Robert, et al. 2023 Below the Glaze: Dated Delftware.
• Published: p. 89, "Large bowls in [Dutch] Delftware are rare...Delft price lists indicate that these bowls were introduced in the market in several sizes. The largest were called 'kastrom' or 'cupboard bowls' referring to their decorative function of being placed on top of a cupboard or cabinet..."