Pertuch, A. R. (1909). German schlagball (German bat-ball): A game of ball described in four grades of difficulty. J.J. McVey.
Παραπομπή σε μορφή Chicago (17η εκδ.)Pertuch, Albert Richard. German Schlagball (German Bat-ball): A Game of Ball Described in Four Grades of Difficulty. Philadelphia, Pa.: J.J. McVey, 1909.
Παραπομπή σε μορφή MLA (8th εκδ.)Pertuch, Albert Richard. German Schlagball (German Bat-ball): A Game of Ball Described in Four Grades of Difficulty. J.J. McVey, 1909.
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