Cita APA (7a ed.)
Pörtner, M. Being Old is Different: Person-Centred Care for Old People. PCCS Books.
Cita estilo Chicago (17a ed.)
Pörtner, Marlis. Being Old Is Different: Person-Centred Care for Old People. Ross-on-Wye, Inglaterra: PCCS Books.
Cita MLA (9a ed.)
Pörtner, Marlis. Being Old Is Different: Person-Centred Care for Old People. PCCS Books.
Precaución: Estas citas no son 100% exactas.