Não informado. (1968). Astrophysics and Space Science: An international journal of cosmic physics. D. Reidel Publishing.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Astrophysics and Space Science: An International Journal of Cosmic Physics. Dordrecht, Holanda: D. Reidel Publishing, 1968.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Astrophysics and Space Science: An International Journal of Cosmic Physics. D. Reidel Publishing, 1968.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.