APA   Click to copy
Cowgill, L. W., & Johnston, R. A. (2018). Biomechanical implications of the onset of walking. Journal of Human Evolution, (122), 133–145.

Chicago/Turabian   Click to copy
Cowgill, Libby W., and R. A. Johnston. “Biomechanical Implications of the Onset of Walking.” Journal of human evolution, no. 122 (2018): 133–145.

MLA   Click to copy
Cowgill, Libby W., and R. A. Johnston. “Biomechanical Implications of the Onset of Walking.” Journal of Human Evolution, no. 122, 2018, pp. 133–45.

@article{libby2018a,
  title = {Biomechanical implications of the onset of walking.},
  year = {2018},
  issue = {122},
  journal = {Journal of human evolution},
  pages = {133-145},
  author = {Cowgill, Libby W. and Johnston, R. A.}
}