(1988). [Sieben] 7 schwarze Tage. [s.n.].
Chicago Style (17th ed.) Citation[Sieben] 7 Schwarze Tage. [s.n.], 1988.
MLA (8th ed.) Citation[Sieben] 7 Schwarze Tage. [s.n.], 1988.
Warning: These citations may not always be 100% accurate.
APA (7th ed.) Citation