Are referendum results binding?

Constitution of the Independent State of Samoa 1960http://www.ilo.org/wcmsp5/groups/public/---ed_protect/---protrav/---ilo_aids/documents/legaldocument/wcms_126235.pdf

109. Amendment of Constitution[?](2). A certificate under the hand of the Speaker that a bill has been passed under the provisions of clause (1) [which include any referendum on customary land] shall be conclusive and shall not be questioned in any Court.