SOFTBALL:SLOW AND FAST PITCH FIFTH EDITION
MARIAN E.KNEER CHARLES L.MCCORD2222 年出版145 页ISBN：
INTERNATIONAL SYMPOSIUM ON SAFETY IN BASEBALL/SOFTBALL
EARL F.HOERNER FRANCIS A.COSGROVE1997 年出版113 页ISBN：
SOFTBALL SLOW AND FAST PITCH FOURTH EDITION
MARIAN E.KNEER AND CHARLES L.MCCORD1987 年出版124 页ISBN：0697072428
NIRSA SLOW PITCH SOFTBALL RULES BOOK & SMPLRES MANUAL THIRD EDITION
2010 年出版71 页ISBN：0736095535
