APA (7th ed.) Citation

Ullman, D. H., Velleman, D. J., & West, D. B. (2021). Problems and Solutions. American Mathematical Monthly, 128(3), 276. https://doi.org/10.1080/00029890.2021.1861418

Chicago Style (17th ed.) Citation

Ullman, Daniel H., Daniel J. Velleman, and Douglas B. West. "Problems and Solutions." American Mathematical Monthly 128, no. 3 (2021): 276. https://doi.org/10.1080/00029890.2021.1861418.

MLA (9th ed.) Citation

Ullman, Daniel H., et al. "Problems and Solutions." American Mathematical Monthly, vol. 128, no. 3, 2021, p. 276, https://doi.org/10.1080/00029890.2021.1861418.