http://www.filosofiafacil.com/Tema%207.%20La%20personalidad.pdf

https://montesdetoledo.files.wordpress.com/2015/04/marx-manifiesto-comunista.pdf

http://www.dfpd.edu.uy/ifd/rocha/m_apoyo/2/sig_freud_el_malestar_cult.pdf http://www.pensament.com/filoxarxa/filoxarxa/terc752r.htm http://www.pensament.com/filoxarxa/filoxarxa/terc752q.htm http://www.pensament.com/filoxarxa/filoxarxa/tant45df.htm http://www.pensament.com/filoxarxa/filoxarxa/tant45dg.htm . http://cdn.preterhuman.net/texts/literature/in_spanish/Sigmund%20Freud%20-%20Totem%20y%20Tab%FA.pdf