1. G. Chr. Lichtenberg. Vermischte Schriften, Band 2 (Dieterich, 1801).
2. P. Nowak. Hodowanie Troglodyt'ow (Kronos, 2014).
3. V.I. Arnold. Do You Need Mathematics at School? (MCNMO, 2004) (in Russian).
4. N.M. Karamzin History of the Russian State, Vol. 1 (Terra, 1998) (in Russian).
5. Galileo Galilei. Opere, Volume II (Nicolo Bettoni e Comp, 1832).