Citazione Stile APA (7a Edizione)

Spon, S. d. (1978). Supplement to History of the barons de Spon, comtes zu Forbach and allied families.

Citazione stile Chigago Style (17a edizione)

Spon, Seymour de. Supplement to History of the Barons De Spon, Comtes Zu Forbach and Allied Families. [S.l.], 1978.

Citatione MLA (8a ed.)

Spon, Seymour de. Supplement to History of the Barons De Spon, Comtes Zu Forbach and Allied Families. 1978.