Parker, M., & Spennemann, D. H. R. (2021). Stille Nacht: COVID and the Ghost of Christmas 2020. MDPI AG.
Cita Chicago (17th ed.)Parker, Murray, i Dirk H. R. Spennemann. Stille Nacht: COVID and the Ghost of Christmas 2020. MDPI AG, 2021.
Cita MLA (9th ed.)Parker, Murray, i Dirk H. R. Spennemann. Stille Nacht: COVID and the Ghost of Christmas 2020. MDPI AG, 2021.
Atenció: Aquestes cites poden no estar 100% correctes.