Particles in Dutch surnames—such as van, van den, van der, de, and ter—are lowercased in prose when the whole name is given:

Joost van der Berg plans to challenge Kaatje de Vries in the municipal council election.

When using only the last name, capitalize the particle:

Today the Volkskrant reported that De Vries would not seek a third term. The campaign office of Van der Berg could not be reached for a comment.

In an index or works-cited list, alphabetize a Dutch name by the main part of the last name and place the lowercased particle after the first name:

Berg, Joost van der

Ee, Elsa van, and Rolf J. Kleber

Vries, Kaatje de

The form of authors’ names in works-cited lists and in-text citations should match exactly:

(Ee and Kleber, “Child” 642)