@book { SustainabilityatUniversitiesOpportunitiesChallengesandTrends,
    title = "Sustainability at Universities - Opportunities, Challenges and Trends",
    author = "Walter {Leal Filho}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1144097"
}