I have seen things like Kim & Song (2008) and Laron, et al. (1983) but since I can't read all of it I need to ask here....
References
Kim, K. S., & Song, G. G. (2008). Penile Growth After Puberty in Patients with a Constitutionally Small Penis. Journal of Pediatric Urology, 4, S63. doi: 10.1016/j.jpurol.2008.01.174
Laron, Z., Mimouni, F., & Pertzelan, A. (1983). Effect of human growth hormone therapy on penile and testicular size in boys with isolated growth hormone deficiency: first year of treatment. Israel journal of medical sciences, 19(4), 338-344. pmid: 6406387