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Edgar, G. A., D. H. Ullman, D. B. West, P. Bracken, E. A. Brown, Z. Franco, C. Friesen, et al. “Problems and solutions.” American Mathematical Monthly 124, no. 5 (May 1, 2017): 465–74. https://doi.org/10.4169/amer.math.monthly.124.5.465.

Edgar GA, Ullman DH, West DB, Bracken P, Brown EA, Franco Z, et al. Problems and solutions. American Mathematical Monthly. 2017 May 1;124(5):465–74.

Edgar, G. A., et al. “Problems and solutions.” American Mathematical Monthly, vol. 124, no. 5, May 2017, pp. 465–74. Scopus, doi:10.4169/amer.math.monthly.124.5.465.

Edgar GA, Ullman DH, West DB, Bracken P, Brown EA, Franco Z, Friesen C, Lipták L, Luttmann R, Miles FB, Ng L, Smiley L, Stolarsky K, Stong R, Stromquist W, Velleman D, Zhang F. Problems and solutions. American Mathematical Monthly. 2017 May 1;124(5):465–474.