Peters, C. C., & Van Voorhis, W. R. (1935). Statistical procedures and their mathematical bases. State College, Pa., School of education, the Pennsylvania state college.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Peters, Charles Clinton, و Walter Roe Van Voorhis. Statistical Procedures and Their Mathematical Bases. Pennsylvania: State College, Pa., School of education, the Pennsylvania state college, 1935.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Peters, Charles Clinton, و Walter Roe Van Voorhis. Statistical Procedures and Their Mathematical Bases. State College, Pa., School of education, the Pennsylvania state college, 1935.
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