FUENTES

• http://www.ehow.com/list_6975645_construction-beam-types.html
• http://www.alibaba.com/product-gs/882722424/sell_steel_truss_girder_with_good.html?s=p
• http://www.maerskline.com/
• http://www.nautilius.com.pe/index.html
• http://www.cosmos.com.pe/Content/Index.aspx
• http://cdscargo.com.pe/