Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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