Não informado. Soviet-bloc research in geophysics, astronomy ans space. Joint Publications Research Service.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Soviet-bloc Research in Geophysics, Astronomy Ans Space. Arlington, Wash: Joint Publications Research Service.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Soviet-bloc Research in Geophysics, Astronomy Ans Space. Joint Publications Research Service.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.