Requirements for a referendum to pass

Constitutionof Moldova

http://aceproject.org/ero-en/regions/europe/MD/the-constitution-of-moldova-2000/at_download/file

Article142. Limits of revision

(1)The provisions regarding the sovereignty, independence and unity of the State,as well as those regarding the permanent neutrality of the State may be revisedonly by referendum based on a majority vote of the registered voting citizens.

ElectoralCode of Moldova (Revised 2012)
http://www.venice.coe.int/webforms/documents/?pdf=CDL-REF(2012)039-e

ElectoralCode:
Article 168. Decision Adoption, Publication and Entrance in Force ofReferendum

Proposal

(1)A republican referendum proposal shall be considered adopted if it gains themajority of voters who participated in the referendum. In the event that thedraft of a constitutional law, which provides the amendment of provisions on thesovereign, independent and unitary character of the state, as well asprovisions related to the permanent status of neutrality of the state,  isproposed for referendum, it shall be considered adopted if it gains at leasthalf of the voter's votes entered on voter lists.

(2)The adopted referendum proposal shall be published in a special issue of theOfficial Monitorof the Republic of Moldova. Date of adoption is considered to be the day ofholding referendum. The proposal shall come in force upon its publishing in theOfficial Monitor or on the date specified in its text.