Cita APA (7th ed.)

24x7. HealthTech Pub. Co.

Cita Chicago (17th ed.)

24x7. East Providence, R.I.: HealthTech Pub. Co.

Cita MLA (9th ed.)

24x7. HealthTech Pub. Co.

Atenció: Aquestes cites poden no estar 100% correctes.