Architects' Data (German: Bauentwurfslehre), also simply known as the Neufert, is a reference book for spatial requirements in building design and site planning. First published in 1936 by Ernst Neufert, its 39 German editions and translations into 17 languages have sold over 500,000 copies. The first English version was published in 1970 and was translated from the original German by Rudolf Herz. Source: Wikipedia (en)