CITATION.md

Bibtex:

@BOOK{percival:tdd:python,
    AUTHOR       = "{Harry J.W.} Percival",
    TITLE        = "Test-Driven Development with Python",
    SUBTITLE     = "Obey the Testing Goat!",
    DATE         = "2014",
    PUBLISHER    = "O'Reilly Media, Inc.",
    ISBN         = "9781449365141"
}