Calm down.

MLA

McMahon, B. “Calm Down.” Nursing Standard (Royal College of Nursing (Great Britain) : 1987), vol. 13, no. 1, Sept. 1998, p. 18. EBSCOhost, https://doi.org/10.7748/ns.13.1.18.s33.

APA

McMahon, B. (1998). Calm down. Nursing Standard (Royal College of Nursing (Great Britain) : 1987), 13(1), 18. https://doi.org/10.7748/ns.13.1.18.s33

Chicago

McMahon, B. 1998. “Calm Down.” Nursing Standard (Royal College of Nursing (Great Britain) : 1987) 13 (1): 18. doi:10.7748/ns.13.1.18.s33.