In-Text from the Same Authors from the Same Year [6.16]
Example of same author surnames narrative and paraphrase:
Diaz (1997a) and Diaz (1997b) noted…
Emerson (2009a) and Emerson (2009b) reported…
Example of same author surnames in paraphrase:
The field of social work covers many areas (Emerson, 2009a, 2009b).