Bungey JH, Millard SG and Grantham MG (2006) Testing of concrete in structures. Fourth ed., Taylor & Francis, London and New York, 352p.
 Bungey JH (1979) Determining concrete strength by using small-diameter cores. Magazine of Concrete Research 31(107): 91-98.
 Neville AM (1996) Properties of concrete. Fourth ed., John Wiley and Sons, Inc., New York, 844p.
 Meininger RC, Wagner FT and Hall KW (1977) Concrete core strength-the effect of Length to Diameter ratio. Journal of Testing and Evaluation, 5(3): 147-153.
 Yip WK and Tam CT (1988) Concrete strength evaluation through the use of small diameter cores. Magazine of Concrete Research, 40(143): 99-105.
 Munday JGL and Dhir RK (1984) Assessment of in situ concrete quality by core testing. In Situ/Nondestructive Testing of Concrete. SP-82, American Concrete Institute, Detroit, 393-410.
 Gaynor RD (1965) Effect of horizontal reinforcing steel on the strength of molded cylinders. J. Am. Concr. Inst., 62(7): 837-840.
 Loo YH, Tan CW and Tam CT (1989) Effects of embedded reinforcement on measured strength of concrete cylinders. Magazine of Concrete Research, 41(164): 11-18.
 Khoury S, Aliabdo AA and Ghazy A (2014) Reliability of core test – Critical assessment and proposed new approach. Alexandria Engineering Journal 53: 169–184.
 Neville A (2001) Core tests – Easy to perform, not easy to interpret. Concrete International, 23(11): 59–68.
 ASTM (2008) C42: Standard method of obtaining and testing drilled cores and sawn beams of concrete. American Society for Testing and Materials, Philadelphia.
 Meininger RC (1968) Effect of core diameter on measured concrete strength. Journal of Materials, 3(2): 320-336.
 Lewis RK (1976) Effect of core diameter on the observed on the strength of concrete cores. Research Report No.50, Commonwealth Scientific and Industrial Research Organization, Division of Building Research, 13 pp.
 Campbell RH and Tobin RE (1967) core and cylinder strengths of natural and lightweight concrete. ACI Journal, Proceedings 64(4): 190-195.
 Bartlett FM and MacGregor JG (1994) Effect of Moisture Condition on Concrete Core Strengths. ACI Materials Journal, 91(3): 227-236.
 Seber GAF and Lee AJ (2003) Linear Regression Analysis. Second Edition, John Wiley & Sons Inc
 Montgomery DC (2013) Design and Analysis of Experiments. John Wiley & Sons, Inc., eighth ed., Arizona State University.