Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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