Each reference form should be authenticated with an official stamp of the referee's institution.

推荐信表格需要盖推荐人学院的章啊？

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The Chinese sovereign bond programme was designed to signal Beijing's official stamp of approval for London as its key non-Asian financial centre partner.

中国在伦敦发行主权债券，旨在表明北京方面官方认可伦敦是其在亚洲之外关键的金融中心合作伙伴。

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Incomplete records or those without the signature of the attending physician, the official stamp of the hospital or a sealed photograph of the applicants are invalid.

缺项、未贴有本人照片或照片上未盖骑缝章的《外国人体格检查记录》无效。

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But that's not all, folks -- each one gets shipped to Switzerland, where it's given the official stamp of authenticity, and returned to the workshop where precious stones are added for the final touch.

ENGADGET: Vertu rings in the Year of the Dragon by welcoming a trio of Signature luxury phones

The designers expect their creation to be the first airline terminal in the country to get an official green stamp of approval, in the form of a LEED Gold certification from the U.S. Green Building Council.

FORBES: Richard Branson Unveils New Eco-Chic San Francisco Airport Terminal

She was detained on Monday for forging official documents and a government stamp, Xinhua reports.

BBC: China