APA (7th ed.) Citation

BS, E., JA, E., & MD, J. (1977). Lumbar spondylolisthesis with isthmic defects. Radiologic clinics of North America, 15(2), 261.

Chicago Style (17th ed.) Citation

BS, Epstein, Epstein JA, and Jones MD. "Lumbar Spondylolisthesis with Isthmic Defects." Radiologic Clinics of North America 15, no. 2 (1977): 261.

MLA (9th ed.) Citation

BS, Epstein, et al. "Lumbar Spondylolisthesis with Isthmic Defects." Radiologic Clinics of North America, vol. 15, no. 2, 1977, p. 261.