docs: function availableSourcesURL(startDate, endDate) {
  		var url = (baseURL() +'/location/datum/sources?locationId=' +locationId);
  		if ( startDate !== undefined ) {
  			url += '&start=' +encodeURIComponent(sn.format.dateFormat(startDate));
  		}
  		if ( endDate !== undefined ) {
  			url += '&end=' +encodeURIComponent(sn.format.dateFormat(endDate));
  		}
  		return url;
  	}