How do I cite a magazine or newspaper article with no volume, issue or page numbering?

In some cases, especially for online sources, the volume, issue and/or page numbering are missing. These numbers may also be omitted for special sections and appendices. If this information is not available, it is left out in the reference list entry.
Page numbers for online articles are often replaced by an eLocator or article number:

López, J. M., Fortuny, G., Puigjaner, D., Herrero, J., Marimon, F., & Garcia, B. J. (2017). Effects of walking in deep venous thrombosis: A new integrated solid and fluid mechanics model. International Journal for Numerical Methods in Biomedical Engineering, 33(5), e2819. https://doi.org/10.1002/cnm.2819

Poloczanska, E. S., Burrows, M. T., Brown, C. J., García Molinos, J., Halpern, B. S., Hoegh- Guldberg, O., Kappel, C. V., Moore, P. J., Richardson, A. J. Schoeman, D.S., & Sydeman, W. J. (2016). Responses of marine organisms to climate change across oceans. Frontiers in Marine Science, 3, Article 62. https://doi.org/10.3389/fmars.2016.00062