APA   Click to copy
Guajardo, C., Montt, E., & Contreras, F. (2016). Ultrasound assessment of quadriceps muscle in COPD patients: Functional and clinical implications.

Chicago/Turabian   Click to copy
Guajardo, Carlos, Eloísa Montt, and F. Contreras. “Ultrasound Assessment of Quadriceps Muscle in COPD Patients: Functional and Clinical Implications” (2016).

MLA   Click to copy
Guajardo, Carlos, et al. Ultrasound Assessment of Quadriceps Muscle in COPD Patients: Functional and Clinical Implications. 2016.

@article{carlos2016a,
  title = {Ultrasound assessment of quadriceps muscle in COPD patients: Functional and clinical implications},
  year = {2016},
  author = {Guajardo, Carlos and Montt, Eloísa and Contreras, F.}
}