求助，关于同事签名的介绍信

marco_lw

PASA手册上说：

Statements must be dated, signed by your employer or a person authorised by your employer (the name, position and contact details of the person making the statement must be clearly indicated) and must include details of the exact periods of employment and a full and detailed description of the nature and content of your work.

1.4.        You may submit a reference from your colleague who occupies or has occupied a higher position than you and is an expert in your nominated occupation, within the organisation you were employed at, on a properly signed and witnessed Statutory Declaration. The Statutory Declaration is to detail as a minimum:

        the reason/s why your colleague is submitting a Statutory Declaration and
        all the necessary detail about your employment experience.

是不是说如果找同事签推荐信，就要出 Statutory Declaration ，但这个 Statutory Declaration 怎么搞啊？
论坛里面也没有听说过这个东西，有最近提交成功的同志帮忙解答一下吗？