Books stack of Free 3D model is available on CGTrader for free. Original author: edson-lopes.
STL (Stereolithography, filesize: 58.7 KB), OBJ (OBJ, filesize: 51.2 KB), 3DS (3D Studio, filesize: 55.3 KB), DAE (Collada, filesize: 103 KB), FBX (Autodesk FBX, filesize: 93.4 KB), IGE (IGES, filesize: 300 Bytes), MAX (Autodesk 3ds Max, filesize: 103 KB), SKP (Sketchup, filesize: 205 KB), OTHER (Other, filesize: 54 KB)