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.

1980

[Open letter.]
In: Colijn en het einde van de coalitie. II. De geschiedenis van de kabinetsformaties 1925–1929. [Door] Dr. G. Puchinger.
Kampen, J.H. Kok 1980, pp. 252–254.
Dated: Amsterdam, May 11, 1899.
Open letter, see: 1899.11.