Proctor, A. (2019) ‘Student paramedics' views on placements in general practice as part of a degree', Journal of Paramedic Practice, 11(12), pp. 519-525.
Lowe, A., Littlewood, C. and McLean, S. (2018) ‘Understanding physical activity promotion in physiotherapy practice: a qualitative study’, Musculoskeletal Science and Practice, 35, pp. 1-7.
You should use Glavin et al., 2021 in your citation but list all of the authors in your reference list. For example:
Citation: Chronotype is a biological factor that affects sleep (Glavin et al., 2021, p.2637).
Glavin, E.E., Ceneus, M., Chanowitz, M., Kantillerakis, J., Mendelow, E., Mosquera, J. and Spaeth, A.M. (2021) 'Relationships between sleep, exercise timing, and chronograph in young adults' Journal of Health Psychology, 26(13), pp. 2636-2647.
Nightingale, J. (2015) ‘Radiography research as a global community’, Radiography, 21(2), pp. 108-109. doi:10.1016/j.radi.2015.03.006.
Including a doi (digital object identifier) is usually optional, just be consistent. It is not needed in the example above but not wrong to add it. It is, however, needed when you are using an online-only journal that has no page numbers. In that case the doi is used in place of page numbers or other missing information in your reference.
An example is provided below: