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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Dr. OLIVE VITROGONSKI: (Through Translator) You have to give bribes whenever you want anything: a document, an official stamp, anything.

NPR: Corruption, Bribery Leave Ordinary Russians Aghast

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

While the 4th Plenum of 1994 had been dominated by high-level personnel changes, the primary achievement this year was to put the official stamp on China's 9th Five-Year Plan and other economic documents that will steer the nation into the next century.

CNN: N A SPEECH EARLIER