Spon, S. d. (1978). Supplement to History of the barons de Spon, comtes zu Forbach and allied families.
Čikaški stil citiranja (17. izdanje)Spon, Seymour de. Supplement to History of the Barons De Spon, Comtes Zu Forbach and Allied Families. [S.l.], 1978.
MLA način citiranja (8. izdanje)Spon, Seymour de. Supplement to History of the Barons De Spon, Comtes Zu Forbach and Allied Families. 1978.
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