APA   Click to copy
Floyd, R. G., Farmer, R. L., Schneider, W. J., & McGrew, K. S. (2021). Theories and measurement of intelligence.

Chicago/Turabian   Click to copy
Floyd, R G, R L Farmer, W J Schneider, and K S McGrew. “Theories and Measurement of Intelligence” (2021).

MLA   Click to copy
Floyd, R. G., et al. Theories and Measurement of Intelligence. psycnet.apa.org, 2021.

@article{floyd2021a,
  title = {Theories and measurement of intelligence},
  year = {2021},
  publisher = {psycnet.apa.org},
  author = {Floyd, R G and Farmer, R L and Schneider, W J and McGrew, K S}
}