《北史·列传·卷七十七》
王延明家有各种图书，想抄录汇集《五经》的算事为《五经宗》，以及古今乐事为《乐书》，又汇集浑天、欹器、地动、铜乌、漏刻、侯风等巧妙制作，连同图画为《器淮》，都让信都芳筹划。
延明家有群书，欲抄集《五经》算事为《五经宗》，及古今乐事为《乐书》，又聚浑天、欹器、地动、铜乌、漏刻、候风诸巧事，并图画为《器准》，并令芳算之。
Wang Yanming’s family had all kinds of books. He intended to copy and compile divination methods from the Five Classics as The Essence of Rituals and ancient music as The Book of Music. He also compiled techniques for making ingenious mechanisms like armillary spheres, astrolabes, seismometers, bronze crows, water clocks, and wind detectors, along with diagrams, as Treasures of Instruments. He put Xin Dufang in charge of this project.