Mohammad Soerjani
The Office of the Minister of State for Population and Environment , 1989
Buku Teks
Wilson, Lynn, 1954-
Information Science Reference, 2016
Buku Teks
National Institute of Educational Planning and Administration , 1985
Buku Teks
National Council of Educational Research and Training, 1983
Buku Teks SO
Unesco-Unep International Environment Education Programme. National Institute of Educational Planning and Administration , 1988
Buku Teks