The only reliable sources are the Migration Regulations and the Migration Act, but they are not much use unless you are trained to use and interpret them properly.
So for most people that leaves the DIBP website, which is riddled with ambiguous and inaccurate information
Nick van Voorst
Registered Migration Agent 0640648
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Please note that this posting is of a general nature only. It does not constitute legal or migration advice and may not apply to your particular circumstances.