Kayal, A., Waters, R., & unknown. (1999). An empirical evaluation of the technology cycle time indicator as ameasure of the pace of technological progress in superconductortechnology.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Kayal, A.A, R.C Waters, و unknown. An Empirical Evaluation of the Technology Cycle Time Indicator as Ameasure of the Pace of Technological Progress in Superconductortechnology. 1999.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Kayal, A.A, et al. An Empirical Evaluation of the Technology Cycle Time Indicator as Ameasure of the Pace of Technological Progress in Superconductortechnology. 1999.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.