Cita APA (7a ed.)

Yousef, G. E. (1988). Chronic enterovirus infection in patients with postviral fatigue syndrome. [s.n.].

Cita Chicago Style (17a ed.)

Yousef, G. E. Chronic Enterovirus Infection in Patients with Postviral Fatigue Syndrome. [S.l.]: [s.n.], 1988.

Cita MLA (9a ed.)

Yousef, G. E. Chronic Enterovirus Infection in Patients with Postviral Fatigue Syndrome. [s.n.], 1988.