I have just started reading and getting to know what this EWB challenge is about for a project for a unit i am studying in university. If you are in university or studying something academically the way to tell for credible sources you use the CRAAP system a quick google search will help you understand and learn how to find credible sources. https://libguides.cdu.edu.au/c.php?g=167948&p=1103060
quick read through this will help heaps.
otherwise, if you are really finding it hard to find credible sources for a specific design area, you got another 6-7 to choose from just choose something else?.
EWB Australia acknowledges the traditional custodians of country throughout Australia and recognise their continuing connection to land, waters and community. We pay our respects to them, their cultures and their land; to Elders both past and present; and to emerging leaders. We recognise that the Aboriginal & Torres Strait Islander people never ceded sovereignty of what we call Australia.