Published in E.J. Halsema--colonial engineer (XI). (1987)

Published in E.J. Halsema--colonial engineer (IX). (1986)

Published in E.J. Halsema--colonial engineer (V). (1985)

Published in E.J. Halsema: colonial engineer (IV). (1985)

Published in E. J. Halsema: colonial engineer. (1983)

Published 1983

Published in E.J. Halsema: colonial engineer (III). (1983)

Published in E.J. Halsema: colonial engineer (II). (1983)

Published 1982

Published in Bulletin Today (1981)