Pershagen, A. (2019). Mining and a Sea of Difficulties: Von Anna-Maria Pershagen. Topos.
Cita Chicago (17th ed.)Pershagen, Anna-Maria. "Mining and a Sea of Difficulties: Von Anna-Maria Pershagen." Topos 2019.
Cita MLA (8th ed.)Pershagen, Anna-Maria. "Mining and a Sea of Difficulties: Von Anna-Maria Pershagen." Topos, 2019.
Atenció: Aquestes cites poden no estar 100% correctes.