Ad libitum. Stethoscope sounds.

MLA

Varcoe R. “Ad Libitum. Stethoscope Sounds.” Annals of Internal Medicine, vol. 147, no. 4, Aug. 2007, p. 277. EBSCOhost, https://doi.org/10.7326/0003-4819-147-4-200708210-00012.

APA

Varcoe R. (2007). Ad libitum. Stethoscope sounds. Annals of Internal Medicine, 147(4), 277. https://doi.org/10.7326/0003-4819-147-4-200708210-00012

Chicago

Varcoe R. 2007. “Ad Libitum. Stethoscope Sounds.” Annals of Internal Medicine 147 (4): 277. doi:10.7326/0003-4819-147-4-200708210-00012.