<%- unless @page.linked_from.empty? -%>
  <span class="linked">
    | Linked from: 
    <%= @page.linked_from.collect { |referring_page| link_to_existing_page referring_page }.join(", ") %>
  </span>
<%- end -%>

<%- unless @page.included_from.empty? -%>
  <span class="linked">
    | Included from: 
    <%= @page.included_from.collect { |referring_page| link_to_existing_page referring_page }.join(", ") %>
  </span>
<%- end -%>