Fox NS, Brennan JS, Chasen ST (2008). "Clinical estimation of fetal weight and the Hawthorne effect". Eur. J. Obstet. Gynecol. Reprod. Biol. 141 (2): 111–4. doi:10.1016/j.ejogrb.2008.07.023. PMID18771841.
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"Eastland Memorial Edition". Western Electric News. August 1915. Archived from the original on September 14, 2011. Retrieved August 14, 2012.
Fox NS, Brennan JS, Chasen ST (2008). "Clinical estimation of fetal weight and the Hawthorne effect". Eur. J. Obstet. Gynecol. Reprod. Biol. 141 (2): 111–4. doi:10.1016/j.ejogrb.2008.07.023. PMID18771841.