Nickel superalloys / editors Jerzy J. Sobczak [i pozostali]. - Krakow, 2022. Redaktor

Ohio Profiles, 20.05.22 https://ohioprofiles-com.translate.goog/person/robert-m-purgert/04bf2f6dc349?_x_tr_sl=en&_x_tr_tl=pl&_x_tr_hl=pl&_x_tr_pto=sc

Ohio Residents, 20.05.22 https://www.ohioresidentdatabase.com/person/OH0014684229/purgert-robert