Sharp, A. Shadow over the Marsh: Can you discover the dark secret which threatens your very life?
Chicago-referens (17:e uppl.)Sharp, Allen. Shadow over the Marsh: Can You Discover the Dark Secret Which Threatens Your Very Life?
MLA-referens (8:e uppl.)Sharp, Allen. Shadow over the Marsh: Can You Discover the Dark Secret Which Threatens Your Very Life?
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.