Off-cyber references may lead you to Kamus Dewan Bahasa dan Pustaka, text books and PMR/SPM reference books. And don't forget your school library. It may have magazine like Hijau which has a lot of environmental articles in it. A few books on pollutions may have sit on the shelves too, just waiting for you to discover them. One of them is Pencemaran Alam Sekitar under 'Selamatkan Bumi Kita' series, published by Jade Green Publications SDN. BHD., KL.. It defined pencemaran alam sekitar as "perubahan secara biologi, fizikal dan kimia terhadap alam sekitar. Pencemaran ini mecakupi udara, bunyi, air dan tanah."
To me, the internet is the fastest and easiest way to look up information on pollution which is enough to help you in your kerja kursus.
So, when u write about the concept of pencemaran alam sekitar, don't forget to acknowledge the sources. You might start with..'Menurut Kamus Dewan Bahasa dan Pustaka, pencemaran alam sekitar ialah "...................." . You put the quotation marks if you copy exactly from it (ambil bulat-bulat).
I got this from the English Wikipedia "pollution is the introduction of contaminants into a natural environment that causes instability, disorder, harm or discomfort to the ecosystem i.e. physical systems or living organisms".
Air pollution is "the release of chemicals and particulates into the atmosphere. Common gaseous pollutants include carbon monoxide, sulfur dioxide, chlorofluorocarbons (CFCs) and nitrogen oxides produced by industry and motor vehicles. Photochemical ozone and smog are created as nitrogen oxides and hydrocarbons react to sunlight. Particulate matter, or fine dust is characterized by their micrometre size PM10 to PM2.5."
You can translate this into Bahasa without having to put quotation marks but do acknowledge the source, ok?
I think, the most 'authoritative' concept is as defined by the Akta Kualiti Alam Sekitar 1974 (It is in English..huhu). I tried to look up the Act but to no avail , so far. The Jabatan Alam Sekitar website was sooo slow to open that i gave up.
Ok. The best thing is to write an intro first before you define 'pencemaran alam sekitar'. For example, something that relates to 'pembangunan dan kemajuan' negara. Then, you can start writing about 'konsep pencemaran alam sekitar berserta dengan contoh' The contoh here should include all the 'jenis-jenis pencemaran alam sekitar'.
So, all the best! Go go chayok! (hmm..i'm not sure of the phrase..hehe)