FERENCE, B. B. (1991). Planethood The Key To Your Future Benjamin B. Ference, Kenkeyes. Loveline Books.
Čikaški stil citiranja (17. izdanje)FERENCE, Benjamin B. Planethood The Key To Your Future Benjamin B. Ference, Kenkeyes. Loveline Books, 1991.
MLA način citiranja (8. izdanje)FERENCE, Benjamin B. Planethood The Key To Your Future Benjamin B. Ference, Kenkeyes. Loveline Books, 1991.
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