scientificNameAuthorship (http://rs.tdwg.org/dwc/terms/scientificNameAuthorship) @return [String] The authorship information for the scientificName formatted according to the conventions of the applicable nomenclaturalCode. If authorship is included in the scientificName field, this field is optional. Example: "(Torr.) J.T. Howell", "(Martinovsk ) Tzvelev", "(Linnaeus 1768)"