APA   Click to copy
P, S., Q, V., O, K.-L., & M, P. (2009). Upper Eyelid Ptosis Revisited. American Journal of Clinical Medicine.

Chicago/Turabian   Click to copy
P, Sudhaker, Vu Q, Kosoko-Lasaki O, and Palmer M. “Upper Eyelid Ptosis Revisited.” American Journal of Clinical Medicine (2009).

MLA   Click to copy
P, Sudhaker, et al. “Upper Eyelid Ptosis Revisited.” American Journal of Clinical Medicine, 2009.

@article{sudhaker2009a,
  title = {Upper Eyelid Ptosis Revisited},
  year = {2009},
  journal = {American Journal of Clinical Medicine},
  author = {P, Sudhaker and Q, Vu and O, Kosoko-Lasaki and M, Palmer}
}