Sijbring, L. G. (1993). A radio continuum and HI line study of the Perseus cluster. Rijksuniversiteit te Groningen.
Čikaški stil citiranja (17. izdanje)Sijbring, Ludolf Gerardus. A Radio Continuum and HI Line Study of the Perseus Cluster. Netherlands: Rijksuniversiteit te Groningen, 1993.
MLA način citiranja (8. izdanje)Sijbring, Ludolf Gerardus. A Radio Continuum and HI Line Study of the Perseus Cluster. Rijksuniversiteit te Groningen, 1993.
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