Road traffic accident prevention report of a seminar-cum-study tour Japan, 15-24 October 1986

Management and techniques of road maintenance : report of a seminar-cum-study tour Japan, 24 October-2 November 1984 volume 1 / United Nations

Management and techniques of road maintenance : report of a seminar-cum-study tour Japan, 24 October-2 November 1984 volume 2 / United Nations

Report of the seminar-cum-study tour on railway track maintenance, China 16-25 September 1986

Walking Tour sebagai Media Edutaiment: Analisis Peran Operatur Tur "CERITA SAKTA" dalam Pengembangan Wisata Urban di Jakarta, Depok, dan Bogor = Walking Tours as Edutainment Media: An Analysis of the Role of "CERITA SAKTA" Tour Operator in Urban Tourism Development in Jakarta, Depok, and Bogor