Pertuch, A. R. (1909). German schlagball (German bat-ball): A game of ball described in four grades of difficulty. J.J. McVey.
Chicago-referens (17:e uppl.)Pertuch, Albert Richard. German Schlagball (German Bat-ball): A Game of Ball Described in Four Grades of Difficulty. Philadelphia, Pa.: J.J. McVey, 1909.
MLA-referens (8:e uppl.)Pertuch, Albert Richard. German Schlagball (German Bat-ball): A Game of Ball Described in Four Grades of Difficulty. J.J. McVey, 1909.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.