If there are two authors, always cite both names in your paper.
Narrative Citation
Aston and Hallam (2011) have observed that most student nurses have received mentoring.
Parenthetical Citation
A nurse mentor's role is to provide opportunities for learning and assessment of student nurses' skills (Aston & Hallam, 2011).
References List
Aston, L., & Hallam, P. (2011). Successful mentoring in nursing. Learning Matters.
