Some sources are a part of a numbered series. For example, a magazine that is published monthly will likely have a volume number and an issue number. You would include both of those numbers in your citation.
Gouveia, Sidney, et al. "Forest Structure Drives Global Diversity of Primates." Journal of Animal Ecology, vol. 83, no. 6, Nov. 2014, pp. 1523-30.
"Marge vs. the Monorail." The Simpsons, performances by Julie Kavner and Phil Hartman, season 4, episode 12, Twentieth Century Fox, 14 Jan. 1993.
De La Torre, Miguel A., editor. Hispanic American Religious Cultures. Vol. 1, ABC-CLIO, 2009.
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