Edwards, A. W. F. (1 March 2012). "Punnett's square". Studies in History and Philosophy of Science Part C: Studies in History and Philosophy of Biological and Biomedical Sciences. Data-Driven Research in the Biological and Biomedical Sciences. 43 (1): 219–224. doi:10.1016/j.shpsc.2011.11.011. ISSN1369-8486. PMID22326091.
Edwards, A. W. F. (1 March 2012). "Punnett's square". Studies in History and Philosophy of Science Part C: Studies in History and Philosophy of Biological and Biomedical Sciences. Data-Driven Research in the Biological and Biomedical Sciences. 43 (1): 219–224. doi:10.1016/j.shpsc.2011.11.011. ISSN1369-8486. PMID22326091.
Edwards, A. W. F. (1 March 2012). "Punnett's square". Studies in History and Philosophy of Science Part C: Studies in History and Philosophy of Biological and Biomedical Sciences. Data-Driven Research in the Biological and Biomedical Sciences. 43 (1): 219–224. doi:10.1016/j.shpsc.2011.11.011. ISSN1369-8486. PMID22326091.
Edwards, A. W. F. (1 March 2012). "Punnett's square". Studies in History and Philosophy of Science Part C: Studies in History and Philosophy of Biological and Biomedical Sciences. Data-Driven Research in the Biological and Biomedical Sciences. 43 (1): 219–224. doi:10.1016/j.shpsc.2011.11.011. ISSN1369-8486. PMID22326091.