A revised and updated version of
Abraham Kuyper: An Annotated Bibliography 1857-2010 by Tjitze Kuipers (2011)

You can buy a printed edition of this book on the site of the publisher.

1937

[Postcard.—Letter.]
In: Kuyper de geweldige … van dichtbij. Door A.C. de Gooyer en Rudolf van Reest. (Libellen-serie: no. 260).
Baarn, Bosch & Keuning [1937], pp. 31, 40–41.

The postcard was reproduced in facsimile (p. 31) to illustrate a humorous anecdote involving Kuyper’s autograph recounted by the journalist Jan Brusse (1873–1941). The letter (pp. 40–41) was sent on March 29, 1914, to Mrs. W.G. van Deth-van den Heuvel, the widow of A.G. van Deth (see 1894.10), on the occasion of her birthday.