MLA

Giamberardino, Maria Adele; Martelletti, Paolo, and Paolo Martelletti. Comorbidities In Headache Disorders. Springer International Publishing, 2017.

APA

Giamberardino, P., & Martelletti, P. (2017). Comorbidities in Headache Disorders. Springer International Publishing.

Chicago

Giamberardino, Maria Adele; Martelletti, Paolo, and Paolo Martelletti. Comorbidities In Headache Disorders. : Springer International Publishing, 2017.