References

@misc{Environmental,
  author = "Berit Anderson  ",
  title = "A Guide to Environmental Stewardship ",
  year = 2013,
  url = "http://www.apu.edu/live_data/files/273/guide_to_environmental_stewarship_at_apu.pdf"}
 
@misc{Economical,
  author = "Jawahir, I S ",
  title = "Sustainable Manufacturing ",
  year = 2008,
  url = "http://www.ncsl.org/Portals/1/Documents/employ/Jawahir-Manuf.pdf"}
 
@misc{Sustainability_main_elements,
  author = "Redefining progress ",
  title = "About Sustainability Indicators",
  year = 2014,
  url = "http://rprogress.org/sustainability_indicators/about_sustainability_indicators.htm"}
 
@misc{Desing_for_Disassembly,
  author = "Guy, Brad Ciarimboli, Nicholas ",
  title = "Desing for Disassembly",
  year = 2006,
  url = "https://your.kingcounty.gov/solidwaste/greenbuilding/documents/Design_for_Disassembly-guide.pdf"}
 
@misc{Design_for_Assembly,
  author = "Stienstra, David ",
  title = "Design for Assembly",
  year = 2006,
  url = "http://me.gatech.edu/files/capstone/L071ME4182DFA"}
@misc{Social_Sustainability,
  author = "Business Dictionary",
  title = "Social Sustainability",
  year = 2015,
  url = "http://www.businessdictionary.com/definition/social-sustainability.html"}
 
@misc{PMMA_Sustainability,
  author = "PMMA-online",
  title = "PMMA sustainability",
  year = 2016,
  url = "http://www.pmma-online.eu/sustainability"}
 
@misc{PVC_Sustainability,
  author = "PVC",
  title = "PVC sustainability",
  year = 2010,
  url = "http://www.pvc.org/en/p/sustainability"}
 
@misc{Slate,
  author = "EMPRESA DE LOUSAS DE VALONGO",
  title = "Slate",
  year = 2016,
  url = "http://www.valongoslate.com/en/material-de-construcao-civil"}
 
@misc{Glue_molding_materials,
  author = "Sustainable graphic design",
  title = "Glue the sustainable designers quick guide",
  year = 2011,
  url = "http://sustainable-graphic-design.blogspot.pt/2011/08/glue-sustainable-designers-quick-guide.html"}
 
@misc{PMMA_glass,
  author = "Escuela ingienerias industriales",
  title = "Vidrios orgánicos",
  year = 2002,
  url = "http://www.eis.uva.es/~macromol/curso03-04/construccion/vidrios.html"}
 
@misc{Copper_properties ,
  author = "Lenntech",
  title = "Propiedades químicas del Cobre - Efectos del Cobre sobre la salud - Efectos ambientales del Cobre",
  year = 2016,
  url = "http://www.lenntech.es/periodica/elementos/cu.htm"}
 
@misc{Slate_pottery,
  author = "Robert Finlay",
  title = "The Pilgrim Art",
  year = 2008,
  url = "https://books.google.pt/books?id=uHWIKuAYbK8C&printsec=frontcover&source=gbs_ge_summary_r&redir_esc=y#v=onepage&q&f=false"}
 
@misc{PVC_properties,
  author = "EMPRESA DE LOUSAS DE VALONGO",
  title = "Problemática medioambiental del PVC",
  year = 2016,
  url = "http://www.eis.uva.es/~macromol/curso04-05/pvc_ma/files/7nuevo.htm"}
 
@misc{PVC_container,
  author = "UE-Perú penx",
  title = "MATERIALES PARA ENVASE Y EMBALAJE",
  year = 2014,
  url = "http://www.mincetur.gob.pe/comercio/ueperu/consultora/docs_taller/Parte_2_Presentacion_Taller_Uso_de_Envases_yEmbalajes_Mod_compatibilidad.pdf"}
===== BibTeX example =====
 
 
 
@Book{GangOfFour,
  author     = "Erich {Gamma} and Richard {Helm} and Ralph {Johnson} and John {Vlissides}",
  author-ref = "Gamma, et al.",
  title      = "Design Patterns: Elements of Reusable Object-Oriented Software",
  publisher  = "Addison-Wesley",
  year       = 1994,
  address    = "Reading, Mass.",
  pages      = 395,
  isbn       = "0-201-63361-2",
  url        = "http://en.wikipedia.org/wiki/Design_Patterns"
}
 
@Article{Knuth1985,
  author    = "Donald Knuth",
  title     = "Deciphering a linear congruential encryption",
  journal   = "IEEE Transactions on Information Theory",
  volume    = "31(1)",
  year      = 1985,
  month     = "Jan",
  publisher = "IEEE",
  pages     = "49-52",
  issn      = "0018-9448",
  url       = "http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=1056997"
}