@book { LearningEmotions,
    title = "Learning Emotions",
    subtitle = "The Influence of Affective Factors on Classroom Learning",
    author = "Philipp {Mayring} and Christoph von {Rhoeneck}",
    year = "2003",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Allemagne",
    url = "https://www.peterlang.com/document/1095203"
}