Leal, F., G. C. D’Eeckenbrugge, and B. K. Holst. “TAXONOMY OF THE GENERA ANANAS AND PSEUDANANAS—AN HISTORICAL REVIEW”. Selbyana, vol. 19, no. 2, Aug. 1998, pp. 227-35, https://ojs.test.flvc.org/selbyana/article/view/120506.