If you use content from the Sulawesi Begonia Data Portal, please cite the original publication/source (e.g. literature, photographer) and the Data Portal, as follows: 

Thomas, D.C., Ardi, W.H., Girmansyah, D., and Hughes, M. 2013, continuously updated. Sulawesi Begonia Data Portal. Electronic resource. http://portal.cybertaxonomy.org/flora-malesiana-prospective/. Accessed on [dd/mm/yyyy].

To cite specific content, please cite the original source publication (please see the references given for each piece of content on a taxon page).