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.

1933

[Platform.—Letter.]
In: Groen van Prinsterer en de Verkiezingen van 1871. Een keerpunt in de wordingsgeschiedenis van de Anti-Revolutionaire Partij. Door Gerrit Marinus den Hartogh.
Academisch proefschrift.
Kampen, J.H. Kok 1933, pp. 43–44, 128–129.
Platform, see: 1871.06.
Letter, see: 1871.08.
Also included in the trade edition of the dissertation.