Termination of Employment format

Does anyone know if the termination of employment certificate (non-teaching jobs) has to follow a certain format? Will a letter signed/stamped by my company specifying the employment duration and last day of employment suffice (for NIA)? Thanks.

If the below reply is not enouh, you can contact to

Workforce Development Agency
Address: 4F., No.439, Zhongping Rd., Xinzhuang Dist., New Taipei City 24219, Taiwan (R.O.C.)
Service hours: Monday to Friday, 8:30a.m.~12:30a.m.;1:30p.m.~5:30p.m.
Office hours for foreigner’s work permit application: Monday to Friday, 8:30a.m ~ 5:30p.m.
Address:10F, No. 39, Sec. 1, Zhonghua Rd., Zhongzheng Dist., Taipei City