Kola Superdeep is in the Guinness Book of World Records, Zemlya i Vselennaya, 1989, no. 3, pp. 9 (in Russian) Cassino, Adam (2003).
2009년 4월 8일에 확인함.  다음 날짜 값 확인 필요: |date= (도움말) Kola Superdeep is in the Guinness Book of World Records, Zemlya i Vselennaya, 1989, no. 3, pp. 9 (러시아어) Cassino, Adam (2003년).