原话
Work Experience - Overseas, Evidence of
Please provide evidence of your overseas work experience. This may include a certified copy of your Employment Contract, a letter/statement from your business/employer or work reference.
从移民局FAQ里看到的,说的蛮笼统
Who can certify a copy of a document?
Any person or agency recognised by the law of the country in which you live can certify documents. All our offices outside Australia have a person who can certify or witness documents. You might have to pay for this service.
领事馆去问过,推荐信不给certify