APA (7th ed.) Citation

SpringerLink (Online service), Filippi, M., & Comi, G. (2002). Primary progressive multiple sclerosis. Springer.

Chicago Style (17th ed.) Citation

SpringerLink (Online service), M. Filippi, and G. Comi. Primary Progressive Multiple Sclerosis. Milano ; New York: Springer, 2002.

MLA (9th ed.) Citation

SpringerLink (Online service), et al. Primary Progressive Multiple Sclerosis. Springer, 2002.