Kellogg, T., W. E. Higgins, and J. Beckner. “Reviewed Works: Icones Pleurothallidinarum XXIV: A First Century of New Species of Stelis of Ecuador by Carlyle A. Luer; A Treasure of Masdevallia, A Monograph of the Genus Masdevallia, Volume 27 by Carlyle A. Luer”. Selbyana, vol. 27, no. 1, Feb. 2006, pp. 101-5, https://journals.flvc.org/selbyana/article/view/121332.