APA (7th ed.) Citation

MA, N., AM, S., & SA, C. (1991). The focus of the discipline of nursing. ANS. Advances in nursing science, 14(1), 1. https://doi.org/10.1097/00012272-199109000-00002

Chicago Style (17th ed.) Citation

MA, Newman, Sime AM, and Corcoran-Perry SA. "The Focus of the Discipline of Nursing." ANS. Advances in Nursing Science 14, no. 1 (1991): 1. https://doi.org/10.1097/00012272-199109000-00002.

MLA (9th ed.) Citation

MA, Newman, et al. "The Focus of the Discipline of Nursing." ANS. Advances in Nursing Science, vol. 14, no. 1, 1991, p. 1, https://doi.org/10.1097/00012272-199109000-00002.