Harald Velneri üliõpilasaastadGross, IlmarHarald-Adam Velner - insener ja veeteadlane1993 / lk. 8-10 https://www.ester.ee/record=b1053756*est

Student yearsGross, IlmarHarald-Adam Velner - engineer and scientist1994 / p. 9-11 https://www.ester.ee/record=b1053757*est