@book { FindingGodinSolitude,
    title = "Finding God in Solitude",
    author = "Donald S. {Whitney}",
    year = "2015",
    publisher = "Peter Lang Verlag",
    address = "New York, United States of America",
    doi = "10.3726/978-1-4539-1292-8",
    url = "https://www.peterlang.com/document/1051456"
}