Hand-held slit lamp with a lid opener.

MLA

Lobel, D., and A. H. Gerber. “Hand-Held Slit Lamp with a Lid Opener.” American Journal of Optometry and Physiological Optics, vol. 56, no. 8, Aug. 1979, pp. 538–39. EBSCOhost, https://doi.org/10.1097/00006324-197908000-00009.

APA

Lobel, D., & Gerber, A. H. (1979). Hand-held slit lamp with a lid opener. American Journal of Optometry and Physiological Optics, 56(8), 538–539. https://doi.org/10.1097/00006324-197908000-00009

Chicago

Lobel, D, and A H Gerber. 1979. “Hand-Held Slit Lamp with a Lid Opener.” American Journal of Optometry and Physiological Optics 56 (8): 538–39. doi:10.1097/00006324-197908000-00009.