@book { AlternativeenergysourcestocombatclimatechangeBiogasproductionusingcosteffectivematerial,
    title = "Alternative energy sources to combat climate change: Biogas production using cost effective material",
    author = "Bezabih {Yimer}",
    year = "2014",
    publisher = "Anchor Academic Publishing",
    address = "Hamburg, Germany",
    url = "https://m.anchor-publishing.com/document/287513"
}