APA (7a ed.)

Howard, R. a., Kellogg, E. a., Staples, G. W., Al-Shehbaz, I. a., Anderson, W. R., & Plowman, T. (1988). Flora of the Lesser Antilles : Leeward and Windward Islands : Dicotyledoneae, part 1. The Arnold Arboretum of Harvard University.