[求助] 457签证 “Previous employment references”具体要求？ 急！

在很着急的办理457签证。其中要求的“Previous employment references”到底要包括什么信息? Checklist上是： "Employment references must be on the letterhead of the employer and include the name, title and contact details of the person providing the reference. The reference should include details of the your work position and dates of employment and should cover a period sufficient to demonstrate relevant skill level." 总觉得这个要求有点模糊。 是需要过去多长时间内的？ 只是要包括之前工作单位的领导或朋友的具体联系方式（或者再加上他们签字）即可，还是要正式的单位人事部门盖章的公函？

回复此楼