《旧唐书·列传·卷十六》
房玄龄在秦王府十多年，经常主持文书方面的工作，每当起草军事文书、章奏表驳，马一停下就写成了，文词简练事理周详，完全不打草稿。
玄龄在秦府十余年，常典管记，每军书表奏，驻马立成，文约理赡，初无稿草。
Fang Xuanling worked as an official in Qin Wangfu for over 10 years, often drafting official documents, and would finish writing military documents, memorials and rebuttals once his horse stopped. His writings were concise and comprehensive, and he never made drafts.