*Nuboer, J.F.W. 1981. A History of Afdeling I (Intelligence) Naval Staff, Batavia, Netherlands East Indies from August 1934 to January 1938. The Cryptogram, the Official Journal of the American Cryptogram Association volume 47, issue 2, pages 1-8.
I have not read the book you mention, so I do not know if there is an overlap between the two sources. This article was written by a Dutch naval officer who was stationed in the NEI before the war and assigned to the codebreaking operation. Hope this source helps.