Keskin, M. Z., Budak, S., Zeyrek, T., Çelik, O., Mertoglu, O., Yoldas, M. and Ilbey, Y. Özlem (2015) “The relationship between serum hormone levels (follicle-stimulating hormone, luteinizing hormone, total testosterone) and semen parameters”, Archivio Italiano di Urologia e Andrologia, 87(3), pp. 194–197. doi: 10.4081/aiua.2015.3.194.